diff --git "a/models/attention_processor.py" "b/models/attention_processor.py" new file mode 100644--- /dev/null +++ "b/models/attention_processor.py" @@ -0,0 +1,3697 @@ +import inspect +import math +from importlib import import_module +from typing import Callable, List, Optional, Union + +import torch +import torch.nn.functional as F +from torch import nn + +from diffusers.image_processor import IPAdapterMaskProcessor +from diffusers.utils import deprecate, logging +from diffusers.utils.import_utils import is_torch_npu_available, is_xformers_available +from diffusers.utils.torch_utils import maybe_allow_in_graph +from diffusers.models.lora import LoRALinearLayer +from .embeddings import apply_rotary_emb, apply_rope + + +logger = logging.get_logger(__name__) # pylint: disable=invalid-name + +if is_torch_npu_available(): + import torch_npu + +if is_xformers_available(): + import xformers + import xformers.ops +else: + xformers = None + + +@maybe_allow_in_graph +class Attention(nn.Module): + r""" + A cross attention layer. + + Parameters: + query_dim (`int`): + The number of channels in the query. + cross_attention_dim (`int`, *optional*): + The number of channels in the encoder_hidden_states. If not given, defaults to `query_dim`. + heads (`int`, *optional*, defaults to 8): + The number of heads to use for multi-head attention. + dim_head (`int`, *optional*, defaults to 64): + The number of channels in each head. + dropout (`float`, *optional*, defaults to 0.0): + The dropout probability to use. + bias (`bool`, *optional*, defaults to False): + Set to `True` for the query, key, and value linear layers to contain a bias parameter. + upcast_attention (`bool`, *optional*, defaults to False): + Set to `True` to upcast the attention computation to `float32`. + upcast_softmax (`bool`, *optional*, defaults to False): + Set to `True` to upcast the softmax computation to `float32`. + cross_attention_norm (`str`, *optional*, defaults to `None`): + The type of normalization to use for the cross attention. Can be `None`, `layer_norm`, or `group_norm`. + cross_attention_norm_num_groups (`int`, *optional*, defaults to 32): + The number of groups to use for the group norm in the cross attention. + added_kv_proj_dim (`int`, *optional*, defaults to `None`): + The number of channels to use for the added key and value projections. If `None`, no projection is used. + norm_num_groups (`int`, *optional*, defaults to `None`): + The number of groups to use for the group norm in the attention. + spatial_norm_dim (`int`, *optional*, defaults to `None`): + The number of channels to use for the spatial normalization. + out_bias (`bool`, *optional*, defaults to `True`): + Set to `True` to use a bias in the output linear layer. + scale_qk (`bool`, *optional*, defaults to `True`): + Set to `True` to scale the query and key by `1 / sqrt(dim_head)`. + only_cross_attention (`bool`, *optional*, defaults to `False`): + Set to `True` to only use cross attention and not added_kv_proj_dim. Can only be set to `True` if + `added_kv_proj_dim` is not `None`. + eps (`float`, *optional*, defaults to 1e-5): + An additional value added to the denominator in group normalization that is used for numerical stability. + rescale_output_factor (`float`, *optional*, defaults to 1.0): + A factor to rescale the output by dividing it with this value. + residual_connection (`bool`, *optional*, defaults to `False`): + Set to `True` to add the residual connection to the output. + _from_deprecated_attn_block (`bool`, *optional*, defaults to `False`): + Set to `True` if the attention block is loaded from a deprecated state dict. + processor (`AttnProcessor`, *optional*, defaults to `None`): + The attention processor to use. If `None`, defaults to `AttnProcessor2_0` if `torch 2.x` is used and + `AttnProcessor` otherwise. + """ + + def __init__( + self, + query_dim: int, + cross_attention_dim: Optional[int] = None, + heads: int = 8, + dim_head: int = 64, + dropout: float = 0.0, + bias: bool = False, + upcast_attention: bool = False, + upcast_softmax: bool = False, + cross_attention_norm: Optional[str] = None, + cross_attention_norm_num_groups: int = 32, + qk_norm: Optional[str] = None, + added_kv_proj_dim: Optional[int] = None, + norm_num_groups: Optional[int] = None, + spatial_norm_dim: Optional[int] = None, + out_bias: bool = True, + scale_qk: bool = True, + only_cross_attention: bool = False, + eps: float = 1e-5, + rescale_output_factor: float = 1.0, + residual_connection: bool = False, + _from_deprecated_attn_block: bool = False, + processor: Optional["AttnProcessor"] = None, + out_dim: int = None, + context_pre_only=None, + ): + super().__init__() + self.inner_dim = out_dim if out_dim is not None else dim_head * heads + self.query_dim = query_dim + self.use_bias = bias + self.is_cross_attention = cross_attention_dim is not None + self.cross_attention_dim = ( + cross_attention_dim if cross_attention_dim is not None else query_dim + ) + self.upcast_attention = upcast_attention + self.upcast_softmax = upcast_softmax + self.rescale_output_factor = rescale_output_factor + self.residual_connection = residual_connection + self.dropout = dropout + self.fused_projections = False + self.out_dim = out_dim if out_dim is not None else query_dim + self.context_pre_only = context_pre_only + + # we make use of this private variable to know whether this class is loaded + # with an deprecated state dict so that we can convert it on the fly + self._from_deprecated_attn_block = _from_deprecated_attn_block + + self.scale_qk = scale_qk + self.scale = dim_head**-0.5 if self.scale_qk else 1.0 + + self.heads = out_dim // dim_head if out_dim is not None else heads + # for slice_size > 0 the attention score computation + # is split across the batch axis to save memory + # You can set slice_size with `set_attention_slice` + self.sliceable_head_dim = heads + + self.added_kv_proj_dim = added_kv_proj_dim + self.only_cross_attention = only_cross_attention + + if self.added_kv_proj_dim is None and self.only_cross_attention: + raise ValueError( + "`only_cross_attention` can only be set to True if `added_kv_proj_dim` is not None. Make sure to set either `only_cross_attention=False` or define `added_kv_proj_dim`." + ) + + if norm_num_groups is not None: + self.group_norm = nn.GroupNorm( + num_channels=query_dim, num_groups=norm_num_groups, eps=eps, affine=True + ) + else: + self.group_norm = None + + if spatial_norm_dim is not None: + self.spatial_norm = SpatialNorm( + f_channels=query_dim, zq_channels=spatial_norm_dim + ) + else: + self.spatial_norm = None + + if qk_norm is None: + self.norm_q = None + self.norm_k = None + elif qk_norm == "layer_norm": + self.norm_q = nn.LayerNorm(dim_head, eps=eps) + self.norm_k = nn.LayerNorm(dim_head, eps=eps) + else: + raise ValueError( + f"unknown qk_norm: {qk_norm}. Should be None or 'layer_norm'" + ) + + if cross_attention_norm is None: + self.norm_cross = None + elif cross_attention_norm == "layer_norm": + self.norm_cross = nn.LayerNorm(self.cross_attention_dim) + elif cross_attention_norm == "group_norm": + if self.added_kv_proj_dim is not None: + # The given `encoder_hidden_states` are initially of shape + # (batch_size, seq_len, added_kv_proj_dim) before being projected + # to (batch_size, seq_len, cross_attention_dim). The norm is applied + # before the projection, so we need to use `added_kv_proj_dim` as + # the number of channels for the group norm. + norm_cross_num_channels = added_kv_proj_dim + else: + norm_cross_num_channels = self.cross_attention_dim + + self.norm_cross = nn.GroupNorm( + num_channels=norm_cross_num_channels, + num_groups=cross_attention_norm_num_groups, + eps=1e-5, + affine=True, + ) + else: + raise ValueError( + f"unknown cross_attention_norm: {cross_attention_norm}. Should be None, 'layer_norm' or 'group_norm'" + ) + + self.to_q = nn.Linear(query_dim, self.inner_dim, bias=bias) + + if not self.only_cross_attention: + # only relevant for the `AddedKVProcessor` classes + self.to_k = nn.Linear(self.cross_attention_dim, self.inner_dim, bias=bias) + self.to_v = nn.Linear(self.cross_attention_dim, self.inner_dim, bias=bias) + else: + self.to_k = None + self.to_v = None + + if self.added_kv_proj_dim is not None: + self.add_k_proj = nn.Linear(added_kv_proj_dim, self.inner_dim) + self.add_v_proj = nn.Linear(added_kv_proj_dim, self.inner_dim) + if self.context_pre_only is not None: + self.add_q_proj = nn.Linear(added_kv_proj_dim, self.inner_dim) + + self.to_out = nn.ModuleList([]) + self.to_out.append(nn.Linear(self.inner_dim, self.out_dim, bias=out_bias)) + self.to_out.append(nn.Dropout(dropout)) + + if self.context_pre_only is not None and not self.context_pre_only: + self.to_add_out = nn.Linear(self.inner_dim, self.out_dim, bias=out_bias) + + # set attention processor + # We use the AttnProcessor2_0 by default when torch 2.x is used which uses + # torch.nn.functional.scaled_dot_product_attention for native Flash/memory_efficient_attention + # but only if it has the default `scale` argument. TODO remove scale_qk check when we move to torch 2.1 + if processor is None: + processor = ( + AttnProcessor2_0() + if hasattr(F, "scaled_dot_product_attention") and self.scale_qk + else AttnProcessor() + ) + self.set_processor(processor) + + def set_use_npu_flash_attention(self, use_npu_flash_attention: bool) -> None: + r""" + Set whether to use npu flash attention from `torch_npu` or not. + + """ + if use_npu_flash_attention: + processor = AttnProcessorNPU() + else: + # set attention processor + # We use the AttnProcessor2_0 by default when torch 2.x is used which uses + # torch.nn.functional.scaled_dot_product_attention for native Flash/memory_efficient_attention + # but only if it has the default `scale` argument. TODO remove scale_qk check when we move to torch 2.1 + processor = ( + AttnProcessor2_0() + if hasattr(F, "scaled_dot_product_attention") and self.scale_qk + else AttnProcessor() + ) + self.set_processor(processor) + + def set_use_memory_efficient_attention_xformers( + self, + use_memory_efficient_attention_xformers: bool, + attention_op: Optional[Callable] = None, + ) -> None: + r""" + Set whether to use memory efficient attention from `xformers` or not. + + Args: + use_memory_efficient_attention_xformers (`bool`): + Whether to use memory efficient attention from `xformers` or not. + attention_op (`Callable`, *optional*): + The attention operation to use. Defaults to `None` which uses the default attention operation from + `xformers`. + """ + is_lora = hasattr(self, "processor") and isinstance( + self.processor, + LORA_ATTENTION_PROCESSORS, + ) + is_custom_diffusion = hasattr(self, "processor") and isinstance( + self.processor, + ( + CustomDiffusionAttnProcessor, + CustomDiffusionXFormersAttnProcessor, + CustomDiffusionAttnProcessor2_0, + ), + ) + is_added_kv_processor = hasattr(self, "processor") and isinstance( + self.processor, + ( + AttnAddedKVProcessor, + AttnAddedKVProcessor2_0, + SlicedAttnAddedKVProcessor, + XFormersAttnAddedKVProcessor, + LoRAAttnAddedKVProcessor, + ), + ) + + if use_memory_efficient_attention_xformers: + if is_added_kv_processor and (is_lora or is_custom_diffusion): + raise NotImplementedError( + f"Memory efficient attention is currently not supported for LoRA or custom diffusion for attention processor type {self.processor}" + ) + if not is_xformers_available(): + raise ModuleNotFoundError( + ( + "Refer to https://github.com/facebookresearch/xformers for more information on how to install" + " xformers" + ), + name="xformers", + ) + elif not torch.cuda.is_available(): + raise ValueError( + "torch.cuda.is_available() should be True but is False. xformers' memory efficient attention is" + " only available for GPU " + ) + else: + try: + # Make sure we can run the memory efficient attention + _ = xformers.ops.memory_efficient_attention( + torch.randn((1, 2, 40), device="cuda"), + torch.randn((1, 2, 40), device="cuda"), + torch.randn((1, 2, 40), device="cuda"), + ) + except Exception as e: + raise e + + if is_lora: + # TODO (sayakpaul): should we throw a warning if someone wants to use the xformers + # variant when using PT 2.0 now that we have LoRAAttnProcessor2_0? + processor = LoRAXFormersAttnProcessor( + hidden_size=self.processor.hidden_size, + cross_attention_dim=self.processor.cross_attention_dim, + rank=self.processor.rank, + attention_op=attention_op, + ) + processor.load_state_dict(self.processor.state_dict()) + processor.to(self.processor.to_q_lora.up.weight.device) + elif is_custom_diffusion: + processor = CustomDiffusionXFormersAttnProcessor( + train_kv=self.processor.train_kv, + train_q_out=self.processor.train_q_out, + hidden_size=self.processor.hidden_size, + cross_attention_dim=self.processor.cross_attention_dim, + attention_op=attention_op, + ) + processor.load_state_dict(self.processor.state_dict()) + if hasattr(self.processor, "to_k_custom_diffusion"): + processor.to(self.processor.to_k_custom_diffusion.weight.device) + elif is_added_kv_processor: + # TODO(Patrick, Suraj, William) - currently xformers doesn't work for UnCLIP + # which uses this type of cross attention ONLY because the attention mask of format + # [0, ..., -10.000, ..., 0, ...,] is not supported + # throw warning + logger.info( + "Memory efficient attention with `xformers` might currently not work correctly if an attention mask is required for the attention operation." + ) + processor = XFormersAttnAddedKVProcessor(attention_op=attention_op) + else: + processor = XFormersAttnProcessor(attention_op=attention_op) + else: + if is_lora: + attn_processor_class = ( + LoRAAttnProcessor2_0 + if hasattr(F, "scaled_dot_product_attention") + else LoRAAttnProcessor + ) + processor = attn_processor_class( + hidden_size=self.processor.hidden_size, + cross_attention_dim=self.processor.cross_attention_dim, + rank=self.processor.rank, + ) + processor.load_state_dict(self.processor.state_dict()) + processor.to(self.processor.to_q_lora.up.weight.device) + elif is_custom_diffusion: + attn_processor_class = ( + CustomDiffusionAttnProcessor2_0 + if hasattr(F, "scaled_dot_product_attention") + else CustomDiffusionAttnProcessor + ) + processor = attn_processor_class( + train_kv=self.processor.train_kv, + train_q_out=self.processor.train_q_out, + hidden_size=self.processor.hidden_size, + cross_attention_dim=self.processor.cross_attention_dim, + ) + processor.load_state_dict(self.processor.state_dict()) + if hasattr(self.processor, "to_k_custom_diffusion"): + processor.to(self.processor.to_k_custom_diffusion.weight.device) + else: + # set attention processor + # We use the AttnProcessor2_0 by default when torch 2.x is used which uses + # torch.nn.functional.scaled_dot_product_attention for native Flash/memory_efficient_attention + # but only if it has the default `scale` argument. TODO remove scale_qk check when we move to torch 2.1 + processor = ( + AttnProcessor2_0() + if hasattr(F, "scaled_dot_product_attention") and self.scale_qk + else AttnProcessor() + ) + + self.set_processor(processor) + + def set_attention_slice(self, slice_size: int) -> None: + r""" + Set the slice size for attention computation. + + Args: + slice_size (`int`): + The slice size for attention computation. + """ + if slice_size is not None and slice_size > self.sliceable_head_dim: + raise ValueError( + f"slice_size {slice_size} has to be smaller or equal to {self.sliceable_head_dim}." + ) + + if slice_size is not None and self.added_kv_proj_dim is not None: + processor = SlicedAttnAddedKVProcessor(slice_size) + elif slice_size is not None: + processor = SlicedAttnProcessor(slice_size) + elif self.added_kv_proj_dim is not None: + processor = AttnAddedKVProcessor() + else: + # set attention processor + # We use the AttnProcessor2_0 by default when torch 2.x is used which uses + # torch.nn.functional.scaled_dot_product_attention for native Flash/memory_efficient_attention + # but only if it has the default `scale` argument. TODO remove scale_qk check when we move to torch 2.1 + processor = ( + AttnProcessor2_0() + if hasattr(F, "scaled_dot_product_attention") and self.scale_qk + else AttnProcessor() + ) + + self.set_processor(processor) + + def set_processor(self, processor: "AttnProcessor") -> None: + r""" + Set the attention processor to use. + + Args: + processor (`AttnProcessor`): + The attention processor to use. + """ + # if current processor is in `self._modules` and if passed `processor` is not, we need to + # pop `processor` from `self._modules` + if ( + hasattr(self, "processor") + and isinstance(self.processor, torch.nn.Module) + and not isinstance(processor, torch.nn.Module) + ): + logger.info( + f"You are removing possibly trained weights of {self.processor} with {processor}" + ) + self._modules.pop("processor") + + self.processor = processor + + def get_processor( + self, return_deprecated_lora: bool = False + ) -> "AttentionProcessor": + r""" + Get the attention processor in use. + + Args: + return_deprecated_lora (`bool`, *optional*, defaults to `False`): + Set to `True` to return the deprecated LoRA attention processor. + + Returns: + "AttentionProcessor": The attention processor in use. + """ + if not return_deprecated_lora: + return self.processor + + # TODO(Sayak, Patrick). The rest of the function is needed to ensure backwards compatible + # serialization format for LoRA Attention Processors. It should be deleted once the integration + # with PEFT is completed. + is_lora_activated = { + name: module.lora_layer is not None + for name, module in self.named_modules() + if hasattr(module, "lora_layer") + } + + # 1. if no layer has a LoRA activated we can return the processor as usual + if not any(is_lora_activated.values()): + return self.processor + + # If doesn't apply LoRA do `add_k_proj` or `add_v_proj` + is_lora_activated.pop("add_k_proj", None) + is_lora_activated.pop("add_v_proj", None) + # 2. else it is not possible that only some layers have LoRA activated + if not all(is_lora_activated.values()): + raise ValueError( + f"Make sure that either all layers or no layers have LoRA activated, but have {is_lora_activated}" + ) + + # 3. And we need to merge the current LoRA layers into the corresponding LoRA attention processor + non_lora_processor_cls_name = self.processor.__class__.__name__ + lora_processor_cls = getattr( + import_module(__name__), "LoRA" + non_lora_processor_cls_name + ) + + hidden_size = self.inner_dim + + # now create a LoRA attention processor from the LoRA layers + if lora_processor_cls in [ + LoRAAttnProcessor, + LoRAAttnProcessor2_0, + LoRAXFormersAttnProcessor, + ]: + kwargs = { + "cross_attention_dim": self.cross_attention_dim, + "rank": self.to_q.lora_layer.rank, + "network_alpha": self.to_q.lora_layer.network_alpha, + "q_rank": self.to_q.lora_layer.rank, + "q_hidden_size": self.to_q.lora_layer.out_features, + "k_rank": self.to_k.lora_layer.rank, + "k_hidden_size": self.to_k.lora_layer.out_features, + "v_rank": self.to_v.lora_layer.rank, + "v_hidden_size": self.to_v.lora_layer.out_features, + "out_rank": self.to_out[0].lora_layer.rank, + "out_hidden_size": self.to_out[0].lora_layer.out_features, + } + + if hasattr(self.processor, "attention_op"): + kwargs["attention_op"] = self.processor.attention_op + + lora_processor = lora_processor_cls(hidden_size, **kwargs) + lora_processor.to_q_lora.load_state_dict(self.to_q.lora_layer.state_dict()) + lora_processor.to_k_lora.load_state_dict(self.to_k.lora_layer.state_dict()) + lora_processor.to_v_lora.load_state_dict(self.to_v.lora_layer.state_dict()) + lora_processor.to_out_lora.load_state_dict( + self.to_out[0].lora_layer.state_dict() + ) + elif lora_processor_cls == LoRAAttnAddedKVProcessor: + lora_processor = lora_processor_cls( + hidden_size, + cross_attention_dim=self.add_k_proj.weight.shape[0], + rank=self.to_q.lora_layer.rank, + network_alpha=self.to_q.lora_layer.network_alpha, + ) + lora_processor.to_q_lora.load_state_dict(self.to_q.lora_layer.state_dict()) + lora_processor.to_k_lora.load_state_dict(self.to_k.lora_layer.state_dict()) + lora_processor.to_v_lora.load_state_dict(self.to_v.lora_layer.state_dict()) + lora_processor.to_out_lora.load_state_dict( + self.to_out[0].lora_layer.state_dict() + ) + + # only save if used + if self.add_k_proj.lora_layer is not None: + lora_processor.add_k_proj_lora.load_state_dict( + self.add_k_proj.lora_layer.state_dict() + ) + lora_processor.add_v_proj_lora.load_state_dict( + self.add_v_proj.lora_layer.state_dict() + ) + else: + lora_processor.add_k_proj_lora = None + lora_processor.add_v_proj_lora = None + else: + raise ValueError(f"{lora_processor_cls} does not exist.") + + return lora_processor + + def forward( + self, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + **cross_attention_kwargs, + ) -> torch.Tensor: + r""" + The forward method of the `Attention` class. + + Args: + hidden_states (`torch.Tensor`): + The hidden states of the query. + encoder_hidden_states (`torch.Tensor`, *optional*): + The hidden states of the encoder. + attention_mask (`torch.Tensor`, *optional*): + The attention mask to use. If `None`, no mask is applied. + **cross_attention_kwargs: + Additional keyword arguments to pass along to the cross attention. + + Returns: + `torch.Tensor`: The output of the attention layer. + """ + # The `Attention` class can call different attention processors / attention functions + # here we simply pass along all tensors to the selected processor class + # For standard processors that are defined here, `**cross_attention_kwargs` is empty + + attn_parameters = set( + inspect.signature(self.processor.__call__).parameters.keys() + ) + quiet_attn_parameters = {"ip_adapter_masks"} + unused_kwargs = [ + k + for k, _ in cross_attention_kwargs.items() + if k not in attn_parameters and k not in quiet_attn_parameters + ] + if len(unused_kwargs) > 0: + logger.warning( + f"cross_attention_kwargs {unused_kwargs} are not expected by {self.processor.__class__.__name__} and will be ignored." + ) + cross_attention_kwargs = { + k: w for k, w in cross_attention_kwargs.items() if k in attn_parameters + } + + return self.processor( + self, + hidden_states, + encoder_hidden_states=encoder_hidden_states, + attention_mask=attention_mask, + **cross_attention_kwargs, + ) + + def batch_to_head_dim(self, tensor: torch.Tensor) -> torch.Tensor: + r""" + Reshape the tensor from `[batch_size, seq_len, dim]` to `[batch_size // heads, seq_len, dim * heads]`. `heads` + is the number of heads initialized while constructing the `Attention` class. + + Args: + tensor (`torch.Tensor`): The tensor to reshape. + + Returns: + `torch.Tensor`: The reshaped tensor. + """ + head_size = self.heads + batch_size, seq_len, dim = tensor.shape + tensor = tensor.reshape(batch_size // head_size, head_size, seq_len, dim) + tensor = tensor.permute(0, 2, 1, 3).reshape( + batch_size // head_size, seq_len, dim * head_size + ) + return tensor + + def head_to_batch_dim(self, tensor: torch.Tensor, out_dim: int = 3) -> torch.Tensor: + r""" + Reshape the tensor from `[batch_size, seq_len, dim]` to `[batch_size, seq_len, heads, dim // heads]` `heads` is + the number of heads initialized while constructing the `Attention` class. + + Args: + tensor (`torch.Tensor`): The tensor to reshape. + out_dim (`int`, *optional*, defaults to `3`): The output dimension of the tensor. If `3`, the tensor is + reshaped to `[batch_size * heads, seq_len, dim // heads]`. + + Returns: + `torch.Tensor`: The reshaped tensor. + """ + head_size = self.heads + if tensor.ndim == 3: + batch_size, seq_len, dim = tensor.shape + extra_dim = 1 + else: + batch_size, extra_dim, seq_len, dim = tensor.shape + tensor = tensor.reshape( + batch_size, seq_len * extra_dim, head_size, dim // head_size + ) + tensor = tensor.permute(0, 2, 1, 3) + + if out_dim == 3: + tensor = tensor.reshape( + batch_size * head_size, seq_len * extra_dim, dim // head_size + ) + + return tensor + + def get_attention_scores( + self, + query: torch.Tensor, + key: torch.Tensor, + attention_mask: torch.Tensor = None, + ) -> torch.Tensor: + r""" + Compute the attention scores. + + Args: + query (`torch.Tensor`): The query tensor. + key (`torch.Tensor`): The key tensor. + attention_mask (`torch.Tensor`, *optional*): The attention mask to use. If `None`, no mask is applied. + + Returns: + `torch.Tensor`: The attention probabilities/scores. + """ + dtype = query.dtype + if self.upcast_attention: + query = query.float() + key = key.float() + + if attention_mask is None: + baddbmm_input = torch.empty( + query.shape[0], + query.shape[1], + key.shape[1], + dtype=query.dtype, + device=query.device, + ) + beta = 0 + else: + baddbmm_input = attention_mask + beta = 1 + + attention_scores = torch.baddbmm( + baddbmm_input, + query, + key.transpose(-1, -2), + beta=beta, + alpha=self.scale, + ) + del baddbmm_input + + if self.upcast_softmax: + attention_scores = attention_scores.float() + + attention_probs = attention_scores.softmax(dim=-1) + del attention_scores + + attention_probs = attention_probs.to(dtype) + + return attention_probs + + def prepare_attention_mask( + self, + attention_mask: torch.Tensor, + target_length: int, + batch_size: int, + out_dim: int = 3, + ) -> torch.Tensor: + r""" + Prepare the attention mask for the attention computation. + + Args: + attention_mask (`torch.Tensor`): + The attention mask to prepare. + target_length (`int`): + The target length of the attention mask. This is the length of the attention mask after padding. + batch_size (`int`): + The batch size, which is used to repeat the attention mask. + out_dim (`int`, *optional*, defaults to `3`): + The output dimension of the attention mask. Can be either `3` or `4`. + + Returns: + `torch.Tensor`: The prepared attention mask. + """ + head_size = self.heads + if attention_mask is None: + return attention_mask + + current_length: int = attention_mask.shape[-1] + if current_length != target_length: + if attention_mask.device.type == "mps": + # HACK: MPS: Does not support padding by greater than dimension of input tensor. + # Instead, we can manually construct the padding tensor. + padding_shape = ( + attention_mask.shape[0], + attention_mask.shape[1], + target_length, + ) + padding = torch.zeros( + padding_shape, + dtype=attention_mask.dtype, + device=attention_mask.device, + ) + attention_mask = torch.cat([attention_mask, padding], dim=2) + else: + # TODO: for pipelines such as stable-diffusion, padding cross-attn mask: + # we want to instead pad by (0, remaining_length), where remaining_length is: + # remaining_length: int = target_length - current_length + # TODO: re-enable tests/models/test_models_unet_2d_condition.py#test_model_xattn_padding + attention_mask = F.pad(attention_mask, (0, target_length), value=0.0) + + if out_dim == 3: + if attention_mask.shape[0] < batch_size * head_size: + attention_mask = attention_mask.repeat_interleave(head_size, dim=0) + elif out_dim == 4: + attention_mask = attention_mask.unsqueeze(1) + attention_mask = attention_mask.repeat_interleave(head_size, dim=1) + + return attention_mask + + def norm_encoder_hidden_states( + self, encoder_hidden_states: torch.Tensor + ) -> torch.Tensor: + r""" + Normalize the encoder hidden states. Requires `self.norm_cross` to be specified when constructing the + `Attention` class. + + Args: + encoder_hidden_states (`torch.Tensor`): Hidden states of the encoder. + + Returns: + `torch.Tensor`: The normalized encoder hidden states. + """ + assert ( + self.norm_cross is not None + ), "self.norm_cross must be defined to call self.norm_encoder_hidden_states" + + if isinstance(self.norm_cross, nn.LayerNorm): + encoder_hidden_states = self.norm_cross(encoder_hidden_states) + elif isinstance(self.norm_cross, nn.GroupNorm): + # Group norm norms along the channels dimension and expects + # input to be in the shape of (N, C, *). In this case, we want + # to norm along the hidden dimension, so we need to move + # (batch_size, sequence_length, hidden_size) -> + # (batch_size, hidden_size, sequence_length) + encoder_hidden_states = encoder_hidden_states.transpose(1, 2) + encoder_hidden_states = self.norm_cross(encoder_hidden_states) + encoder_hidden_states = encoder_hidden_states.transpose(1, 2) + else: + assert False + + return encoder_hidden_states + + @torch.no_grad() + def fuse_projections(self, fuse=True): + device = self.to_q.weight.data.device + dtype = self.to_q.weight.data.dtype + + if not self.is_cross_attention: + # fetch weight matrices. + concatenated_weights = torch.cat( + [self.to_q.weight.data, self.to_k.weight.data, self.to_v.weight.data] + ) + in_features = concatenated_weights.shape[1] + out_features = concatenated_weights.shape[0] + + # create a new single projection layer and copy over the weights. + self.to_qkv = nn.Linear( + in_features, + out_features, + bias=self.use_bias, + device=device, + dtype=dtype, + ) + self.to_qkv.weight.copy_(concatenated_weights) + if self.use_bias: + concatenated_bias = torch.cat( + [self.to_q.bias.data, self.to_k.bias.data, self.to_v.bias.data] + ) + self.to_qkv.bias.copy_(concatenated_bias) + + else: + concatenated_weights = torch.cat( + [self.to_k.weight.data, self.to_v.weight.data] + ) + in_features = concatenated_weights.shape[1] + out_features = concatenated_weights.shape[0] + + self.to_kv = nn.Linear( + in_features, + out_features, + bias=self.use_bias, + device=device, + dtype=dtype, + ) + self.to_kv.weight.copy_(concatenated_weights) + if self.use_bias: + concatenated_bias = torch.cat( + [self.to_k.bias.data, self.to_v.bias.data] + ) + self.to_kv.bias.copy_(concatenated_bias) + + self.fused_projections = fuse + + +class AttnProcessor: + r""" + Default processor for performing attention-related computations. + """ + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + query = attn.head_to_batch_dim(query) + key = attn.head_to_batch_dim(key) + value = attn.head_to_batch_dim(value) + + attention_probs = attn.get_attention_scores(query, key, attention_mask) + hidden_states = torch.bmm(attention_probs, value) + hidden_states = attn.batch_to_head_dim(hidden_states) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class CustomDiffusionAttnProcessor(nn.Module): + r""" + Processor for implementing attention for the Custom Diffusion method. + + Args: + train_kv (`bool`, defaults to `True`): + Whether to newly train the key and value matrices corresponding to the text features. + train_q_out (`bool`, defaults to `True`): + Whether to newly train query matrices corresponding to the latent image features. + hidden_size (`int`, *optional*, defaults to `None`): + The hidden size of the attention layer. + cross_attention_dim (`int`, *optional*, defaults to `None`): + The number of channels in the `encoder_hidden_states`. + out_bias (`bool`, defaults to `True`): + Whether to include the bias parameter in `train_q_out`. + dropout (`float`, *optional*, defaults to 0.0): + The dropout probability to use. + """ + + def __init__( + self, + train_kv: bool = True, + train_q_out: bool = True, + hidden_size: Optional[int] = None, + cross_attention_dim: Optional[int] = None, + out_bias: bool = True, + dropout: float = 0.0, + ): + super().__init__() + self.train_kv = train_kv + self.train_q_out = train_q_out + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + + # `_custom_diffusion` id for easy serialization and loading. + if self.train_kv: + self.to_k_custom_diffusion = nn.Linear( + cross_attention_dim or hidden_size, hidden_size, bias=False + ) + self.to_v_custom_diffusion = nn.Linear( + cross_attention_dim or hidden_size, hidden_size, bias=False + ) + if self.train_q_out: + self.to_q_custom_diffusion = nn.Linear(hidden_size, hidden_size, bias=False) + self.to_out_custom_diffusion = nn.ModuleList([]) + self.to_out_custom_diffusion.append( + nn.Linear(hidden_size, hidden_size, bias=out_bias) + ) + self.to_out_custom_diffusion.append(nn.Dropout(dropout)) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + ) -> torch.Tensor: + batch_size, sequence_length, _ = hidden_states.shape + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + if self.train_q_out: + query = self.to_q_custom_diffusion(hidden_states).to(attn.to_q.weight.dtype) + else: + query = attn.to_q(hidden_states.to(attn.to_q.weight.dtype)) + + if encoder_hidden_states is None: + crossattn = False + encoder_hidden_states = hidden_states + else: + crossattn = True + if attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + if self.train_kv: + key = self.to_k_custom_diffusion( + encoder_hidden_states.to(self.to_k_custom_diffusion.weight.dtype) + ) + value = self.to_v_custom_diffusion( + encoder_hidden_states.to(self.to_v_custom_diffusion.weight.dtype) + ) + key = key.to(attn.to_q.weight.dtype) + value = value.to(attn.to_q.weight.dtype) + else: + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + if crossattn: + detach = torch.ones_like(key) + detach[:, :1, :] = detach[:, :1, :] * 0.0 + key = detach * key + (1 - detach) * key.detach() + value = detach * value + (1 - detach) * value.detach() + + query = attn.head_to_batch_dim(query) + key = attn.head_to_batch_dim(key) + value = attn.head_to_batch_dim(value) + + attention_probs = attn.get_attention_scores(query, key, attention_mask) + hidden_states = torch.bmm(attention_probs, value) + hidden_states = attn.batch_to_head_dim(hidden_states) + + if self.train_q_out: + # linear proj + hidden_states = self.to_out_custom_diffusion[0](hidden_states) + # dropout + hidden_states = self.to_out_custom_diffusion[1](hidden_states) + else: + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + return hidden_states + + +class AttnAddedKVProcessor: + r""" + Processor for performing attention-related computations with extra learnable key and value matrices for the text + encoder. + """ + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + + hidden_states = hidden_states.view( + hidden_states.shape[0], hidden_states.shape[1], -1 + ).transpose(1, 2) + batch_size, sequence_length, _ = hidden_states.shape + + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2) + + query = attn.to_q(hidden_states) + query = attn.head_to_batch_dim(query) + + encoder_hidden_states_key_proj = attn.add_k_proj(encoder_hidden_states) + encoder_hidden_states_value_proj = attn.add_v_proj(encoder_hidden_states) + encoder_hidden_states_key_proj = attn.head_to_batch_dim( + encoder_hidden_states_key_proj + ) + encoder_hidden_states_value_proj = attn.head_to_batch_dim( + encoder_hidden_states_value_proj + ) + + if not attn.only_cross_attention: + key = attn.to_k(hidden_states) + value = attn.to_v(hidden_states) + key = attn.head_to_batch_dim(key) + value = attn.head_to_batch_dim(value) + key = torch.cat([encoder_hidden_states_key_proj, key], dim=1) + value = torch.cat([encoder_hidden_states_value_proj, value], dim=1) + else: + key = encoder_hidden_states_key_proj + value = encoder_hidden_states_value_proj + + attention_probs = attn.get_attention_scores(query, key, attention_mask) + hidden_states = torch.bmm(attention_probs, value) + hidden_states = attn.batch_to_head_dim(hidden_states) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + hidden_states = hidden_states.transpose(-1, -2).reshape(residual.shape) + hidden_states = hidden_states + residual + + return hidden_states + + +class AttnAddedKVProcessor2_0: + r""" + Processor for performing scaled dot-product attention (enabled by default if you're using PyTorch 2.0), with extra + learnable key and value matrices for the text encoder. + """ + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnAddedKVProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + + hidden_states = hidden_states.view( + hidden_states.shape[0], hidden_states.shape[1], -1 + ).transpose(1, 2) + batch_size, sequence_length, _ = hidden_states.shape + + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size, out_dim=4 + ) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2) + + query = attn.to_q(hidden_states) + query = attn.head_to_batch_dim(query, out_dim=4) + + encoder_hidden_states_key_proj = attn.add_k_proj(encoder_hidden_states) + encoder_hidden_states_value_proj = attn.add_v_proj(encoder_hidden_states) + encoder_hidden_states_key_proj = attn.head_to_batch_dim( + encoder_hidden_states_key_proj, out_dim=4 + ) + encoder_hidden_states_value_proj = attn.head_to_batch_dim( + encoder_hidden_states_value_proj, out_dim=4 + ) + + if not attn.only_cross_attention: + key = attn.to_k(hidden_states) + value = attn.to_v(hidden_states) + key = attn.head_to_batch_dim(key, out_dim=4) + value = attn.head_to_batch_dim(value, out_dim=4) + key = torch.cat([encoder_hidden_states_key_proj, key], dim=2) + value = torch.cat([encoder_hidden_states_value_proj, value], dim=2) + else: + key = encoder_hidden_states_key_proj + value = encoder_hidden_states_value_proj + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False + ) + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, residual.shape[1] + ) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + hidden_states = hidden_states.transpose(-1, -2).reshape(residual.shape) + hidden_states = hidden_states + residual + + return hidden_states + + +class JointAttnProcessor2_0: + """Attention processor used typically in processing the SD3-like self-attention projections.""" + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.FloatTensor, + encoder_hidden_states: torch.FloatTensor = None, + attention_mask: Optional[torch.FloatTensor] = None, + *args, + **kwargs, + ) -> torch.FloatTensor: + residual = hidden_states + + input_ndim = hidden_states.ndim + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + context_input_ndim = encoder_hidden_states.ndim + if context_input_ndim == 4: + batch_size, channel, height, width = encoder_hidden_states.shape + encoder_hidden_states = encoder_hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size = encoder_hidden_states.shape[0] + + # `sample` projections. + query = attn.to_q(hidden_states) + key = attn.to_k(hidden_states) + value = attn.to_v(hidden_states) + + # `context` projections. + encoder_hidden_states_query_proj = attn.add_q_proj(encoder_hidden_states) + encoder_hidden_states_key_proj = attn.add_k_proj(encoder_hidden_states) + encoder_hidden_states_value_proj = attn.add_v_proj(encoder_hidden_states) + + # attention + query = torch.cat([query, encoder_hidden_states_query_proj], dim=1) + key = torch.cat([key, encoder_hidden_states_key_proj], dim=1) + value = torch.cat([value, encoder_hidden_states_value_proj], dim=1) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + hidden_states = hidden_states = F.scaled_dot_product_attention( + query, key, value, dropout_p=0.0, is_causal=False + ) + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # Split the attention outputs. + hidden_states, encoder_hidden_states = ( + hidden_states[:, : residual.shape[1]], + hidden_states[:, residual.shape[1] :], + ) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + if not attn.context_pre_only: + encoder_hidden_states = attn.to_add_out(encoder_hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + if context_input_ndim == 4: + encoder_hidden_states = encoder_hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + return hidden_states, encoder_hidden_states + + +class JointAttnROPEProcessor2_0: + """Attention processor used typically in processing the SD3-like self-attention projections.""" + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.FloatTensor, + encoder_hidden_states: torch.FloatTensor = None, + image_rotary_emb: torch.FloatTensor = None, + attention_mask: Optional[torch.FloatTensor] = None, + *args, + **kwargs, + ) -> torch.FloatTensor: + residual = hidden_states + + input_ndim = hidden_states.ndim + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + context_input_ndim = encoder_hidden_states.ndim + if context_input_ndim == 4: + batch_size, channel, height, width = encoder_hidden_states.shape + encoder_hidden_states = encoder_hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size = encoder_hidden_states.shape[0] + + # `sample` projections. + query = attn.to_q(hidden_states) + key = attn.to_k(hidden_states) + value = attn.to_v(hidden_states) + + # `context` projections. + encoder_hidden_states_query_proj = attn.add_q_proj(encoder_hidden_states) + encoder_hidden_states_key_proj = attn.add_k_proj(encoder_hidden_states) + encoder_hidden_states_value_proj = attn.add_v_proj(encoder_hidden_states) + + # attention + query = torch.cat([query, encoder_hidden_states_query_proj], dim=1) + key = torch.cat([key, encoder_hidden_states_key_proj], dim=1) + value = torch.cat([value, encoder_hidden_states_value_proj], dim=1) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + if attn.norm_q is not None: + query = attn.norm_q(query) + if attn.norm_k is not None: + key = attn.norm_k(key) + + if image_rotary_emb is not None: + query = torch.cat( + [ + apply_rotary_emb( + query[:, :, : residual.shape[1]], image_rotary_emb + ), + query[:, :, residual.shape[1] :], + ], + dim=2, + ) + key = torch.cat( + [ + apply_rotary_emb(key[:, :, : residual.shape[1]], image_rotary_emb), + key[:, :, residual.shape[1] :], + ], + dim=2, + ) + + hidden_states = hidden_states = F.scaled_dot_product_attention( + query, key, value, dropout_p=0.0, is_causal=False + ) + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # Split the attention outputs. + hidden_states, encoder_hidden_states = ( + hidden_states[:, : residual.shape[1]], + hidden_states[:, residual.shape[1] :], + ) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + if not attn.context_pre_only: + encoder_hidden_states = attn.to_add_out(encoder_hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + if context_input_ndim == 4: + encoder_hidden_states = encoder_hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + return hidden_states, encoder_hidden_states + + +class FusedJointAttnProcessor2_0: + """Attention processor used typically in processing the SD3-like self-attention projections.""" + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.FloatTensor, + encoder_hidden_states: torch.FloatTensor = None, + attention_mask: Optional[torch.FloatTensor] = None, + *args, + **kwargs, + ) -> torch.FloatTensor: + residual = hidden_states + + input_ndim = hidden_states.ndim + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + context_input_ndim = encoder_hidden_states.ndim + if context_input_ndim == 4: + batch_size, channel, height, width = encoder_hidden_states.shape + encoder_hidden_states = encoder_hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size = encoder_hidden_states.shape[0] + + # `sample` projections. + qkv = attn.to_qkv(hidden_states) + split_size = qkv.shape[-1] // 3 + query, key, value = torch.split(qkv, split_size, dim=-1) + + # `context` projections. + encoder_qkv = attn.to_added_qkv(encoder_hidden_states) + split_size = encoder_qkv.shape[-1] // 3 + ( + encoder_hidden_states_query_proj, + encoder_hidden_states_key_proj, + encoder_hidden_states_value_proj, + ) = torch.split(encoder_qkv, split_size, dim=-1) + + # attention + query = torch.cat([query, encoder_hidden_states_query_proj], dim=1) + key = torch.cat([key, encoder_hidden_states_key_proj], dim=1) + value = torch.cat([value, encoder_hidden_states_value_proj], dim=1) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + hidden_states = hidden_states = F.scaled_dot_product_attention( + query, key, value, dropout_p=0.0, is_causal=False + ) + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # Split the attention outputs. + hidden_states, encoder_hidden_states = ( + hidden_states[:, : residual.shape[1]], + hidden_states[:, residual.shape[1] :], + ) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + if not attn.context_pre_only: + encoder_hidden_states = attn.to_add_out(encoder_hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + if context_input_ndim == 4: + encoder_hidden_states = encoder_hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + return hidden_states, encoder_hidden_states + + +class XFormersAttnAddedKVProcessor: + r""" + Processor for implementing memory efficient attention using xFormers. + + Args: + attention_op (`Callable`, *optional*, defaults to `None`): + The base + [operator](https://facebookresearch.github.io/xformers/components/ops.html#xformers.ops.AttentionOpBase) to + use as the attention operator. It is recommended to set to `None`, and allow xFormers to choose the best + operator. + """ + + def __init__(self, attention_op: Optional[Callable] = None): + self.attention_op = attention_op + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + ) -> torch.Tensor: + residual = hidden_states + hidden_states = hidden_states.view( + hidden_states.shape[0], hidden_states.shape[1], -1 + ).transpose(1, 2) + batch_size, sequence_length, _ = hidden_states.shape + + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2) + + query = attn.to_q(hidden_states) + query = attn.head_to_batch_dim(query) + + encoder_hidden_states_key_proj = attn.add_k_proj(encoder_hidden_states) + encoder_hidden_states_value_proj = attn.add_v_proj(encoder_hidden_states) + encoder_hidden_states_key_proj = attn.head_to_batch_dim( + encoder_hidden_states_key_proj + ) + encoder_hidden_states_value_proj = attn.head_to_batch_dim( + encoder_hidden_states_value_proj + ) + + if not attn.only_cross_attention: + key = attn.to_k(hidden_states) + value = attn.to_v(hidden_states) + key = attn.head_to_batch_dim(key) + value = attn.head_to_batch_dim(value) + key = torch.cat([encoder_hidden_states_key_proj, key], dim=1) + value = torch.cat([encoder_hidden_states_value_proj, value], dim=1) + else: + key = encoder_hidden_states_key_proj + value = encoder_hidden_states_value_proj + + hidden_states = xformers.ops.memory_efficient_attention( + query, + key, + value, + attn_bias=attention_mask, + op=self.attention_op, + scale=attn.scale, + ) + hidden_states = hidden_states.to(query.dtype) + hidden_states = attn.batch_to_head_dim(hidden_states) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + hidden_states = hidden_states.transpose(-1, -2).reshape(residual.shape) + hidden_states = hidden_states + residual + + return hidden_states + + +class XFormersAttnProcessor: + r""" + Processor for implementing memory efficient attention using xFormers. + + Args: + attention_op (`Callable`, *optional*, defaults to `None`): + The base + [operator](https://facebookresearch.github.io/xformers/components/ops.html#xformers.ops.AttentionOpBase) to + use as the attention operator. It is recommended to set to `None`, and allow xFormers to choose the best + operator. + """ + + def __init__(self, attention_op: Optional[Callable] = None): + self.attention_op = attention_op + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, key_tokens, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + attention_mask = attn.prepare_attention_mask( + attention_mask, key_tokens, batch_size + ) + if attention_mask is not None: + # expand our mask's singleton query_tokens dimension: + # [batch*heads, 1, key_tokens] -> + # [batch*heads, query_tokens, key_tokens] + # so that it can be added as a bias onto the attention scores that xformers computes: + # [batch*heads, query_tokens, key_tokens] + # we do this explicitly because xformers doesn't broadcast the singleton dimension for us. + _, query_tokens, _ = hidden_states.shape + attention_mask = attention_mask.expand(-1, query_tokens, -1) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + query = attn.head_to_batch_dim(query).contiguous() + key = attn.head_to_batch_dim(key).contiguous() + value = attn.head_to_batch_dim(value).contiguous() + + hidden_states = xformers.ops.memory_efficient_attention( + query, + key, + value, + attn_bias=attention_mask, + op=self.attention_op, + scale=attn.scale, + ) + hidden_states = hidden_states.to(query.dtype) + hidden_states = attn.batch_to_head_dim(hidden_states) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class AttnProcessorNPU: + r""" + Processor for implementing flash attention using torch_npu. Torch_npu supports only fp16 and bf16 data types. If + fp32 is used, F.scaled_dot_product_attention will be used for computation, but the acceleration effect on NPU is + not significant. + + """ + + def __init__(self): + if not is_torch_npu_available(): + raise ImportError( + "AttnProcessorNPU requires torch_npu extensions and is supported only on npu devices." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + if attention_mask is not None: + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + # scaled_dot_product_attention expects attention_mask shape to be + # (batch, heads, source_length, target_length) + attention_mask = attention_mask.view( + batch_size, attn.heads, -1, attention_mask.shape[-1] + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + if query.dtype in (torch.float16, torch.bfloat16): + hidden_states = torch_npu.npu_fusion_attention( + query, + key, + value, + attn.heads, + input_layout="BNSD", + pse=None, + atten_mask=attention_mask, + scale=1.0 / math.sqrt(query.shape[-1]), + pre_tockens=65536, + next_tockens=65536, + keep_prob=1.0, + sync=False, + inner_precise=0, + )[0] + else: + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, + key, + value, + attn_mask=attention_mask, + dropout_p=0.0, + is_causal=False, + ) + + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class AttnProcessor2_0: + r""" + Processor for implementing scaled dot-product attention (enabled by default if you're using PyTorch 2.0). + """ + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + if attention_mask is not None: + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + # scaled_dot_product_attention expects attention_mask shape to be + # (batch, heads, source_length, target_length) + attention_mask = attention_mask.view( + batch_size, attn.heads, -1, attention_mask.shape[-1] + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False + ) + + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class HunyuanAttnProcessor2_0: + r""" + Processor for implementing scaled dot-product attention (enabled by default if you're using PyTorch 2.0). This is + used in the HunyuanDiT model. It applies a s normalization layer and rotary embedding on query and key vector. + """ + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + image_rotary_emb: Optional[torch.Tensor] = None, + ) -> torch.Tensor: + + residual = hidden_states + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + if attention_mask is not None: + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + # scaled_dot_product_attention expects attention_mask shape to be + # (batch, heads, source_length, target_length) + attention_mask = attention_mask.view( + batch_size, attn.heads, -1, attention_mask.shape[-1] + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + if attn.norm_q is not None: + query = attn.norm_q(query) + if attn.norm_k is not None: + key = attn.norm_k(key) + + # Apply RoPE if needed + if image_rotary_emb is not None: + query = apply_rotary_emb(query, image_rotary_emb) + if not attn.is_cross_attention: + key = apply_rotary_emb(key, image_rotary_emb) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False + ) + + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class AttnRopeProcessor2_0: + r""" + Processor for implementing scaled dot-product attention (enabled by default if you're using PyTorch 2.0). + """ + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + frame_rotary_emb: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + if attention_mask is not None: + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + # scaled_dot_product_attention expects attention_mask shape to be + # (batch, heads, source_length, target_length) + attention_mask = attention_mask.view( + batch_size, attn.heads, -1, attention_mask.shape[-1] + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + # Apply RoPE if needed + if frame_rotary_emb is not None: + # (batch_size, num_heads, seq_len, head_dim) + query = apply_rope(query, frame_rotary_emb) + if not attn.is_cross_attention: + key = apply_rope(key, frame_rotary_emb) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False + ) + + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class FusedAttnProcessor2_0: + r""" + Processor for implementing scaled dot-product attention (enabled by default if you're using PyTorch 2.0). It uses + fused projection layers. For self-attention modules, all projection matrices (i.e., query, key, value) are fused. + For cross-attention modules, key and value projection matrices are fused. + + + + This API is currently 🧪 experimental in nature and can change in future. + + + """ + + def __init__(self): + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "FusedAttnProcessor2_0 requires at least PyTorch 2.0, to use it. Please upgrade PyTorch to > 2.0." + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + *args, + **kwargs, + ) -> torch.Tensor: + if len(args) > 0 or kwargs.get("scale", None) is not None: + deprecation_message = "The `scale` argument is deprecated and will be ignored. Please remove it, as passing it will raise an error in the future. `scale` should directly be passed while calling the underlying pipeline component i.e., via `cross_attention_kwargs`." + deprecate("scale", "1.0.0", deprecation_message) + + residual = hidden_states + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + if attention_mask is not None: + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + # scaled_dot_product_attention expects attention_mask shape to be + # (batch, heads, source_length, target_length) + attention_mask = attention_mask.view( + batch_size, attn.heads, -1, attention_mask.shape[-1] + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + if encoder_hidden_states is None: + qkv = attn.to_qkv(hidden_states) + split_size = qkv.shape[-1] // 3 + query, key, value = torch.split(qkv, split_size, dim=-1) + else: + if attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + query = attn.to_q(hidden_states) + + kv = attn.to_kv(encoder_hidden_states) + split_size = kv.shape[-1] // 2 + key, value = torch.split(kv, split_size, dim=-1) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False + ) + + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class CustomDiffusionXFormersAttnProcessor(nn.Module): + r""" + Processor for implementing memory efficient attention using xFormers for the Custom Diffusion method. + + Args: + train_kv (`bool`, defaults to `True`): + Whether to newly train the key and value matrices corresponding to the text features. + train_q_out (`bool`, defaults to `True`): + Whether to newly train query matrices corresponding to the latent image features. + hidden_size (`int`, *optional*, defaults to `None`): + The hidden size of the attention layer. + cross_attention_dim (`int`, *optional*, defaults to `None`): + The number of channels in the `encoder_hidden_states`. + out_bias (`bool`, defaults to `True`): + Whether to include the bias parameter in `train_q_out`. + dropout (`float`, *optional*, defaults to 0.0): + The dropout probability to use. + attention_op (`Callable`, *optional*, defaults to `None`): + The base + [operator](https://facebookresearch.github.io/xformers/components/ops.html#xformers.ops.AttentionOpBase) to use + as the attention operator. It is recommended to set to `None`, and allow xFormers to choose the best operator. + """ + + def __init__( + self, + train_kv: bool = True, + train_q_out: bool = False, + hidden_size: Optional[int] = None, + cross_attention_dim: Optional[int] = None, + out_bias: bool = True, + dropout: float = 0.0, + attention_op: Optional[Callable] = None, + ): + super().__init__() + self.train_kv = train_kv + self.train_q_out = train_q_out + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + self.attention_op = attention_op + + # `_custom_diffusion` id for easy serialization and loading. + if self.train_kv: + self.to_k_custom_diffusion = nn.Linear( + cross_attention_dim or hidden_size, hidden_size, bias=False + ) + self.to_v_custom_diffusion = nn.Linear( + cross_attention_dim or hidden_size, hidden_size, bias=False + ) + if self.train_q_out: + self.to_q_custom_diffusion = nn.Linear(hidden_size, hidden_size, bias=False) + self.to_out_custom_diffusion = nn.ModuleList([]) + self.to_out_custom_diffusion.append( + nn.Linear(hidden_size, hidden_size, bias=out_bias) + ) + self.to_out_custom_diffusion.append(nn.Dropout(dropout)) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + ) -> torch.Tensor: + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + + if self.train_q_out: + query = self.to_q_custom_diffusion(hidden_states).to(attn.to_q.weight.dtype) + else: + query = attn.to_q(hidden_states.to(attn.to_q.weight.dtype)) + + if encoder_hidden_states is None: + crossattn = False + encoder_hidden_states = hidden_states + else: + crossattn = True + if attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + if self.train_kv: + key = self.to_k_custom_diffusion( + encoder_hidden_states.to(self.to_k_custom_diffusion.weight.dtype) + ) + value = self.to_v_custom_diffusion( + encoder_hidden_states.to(self.to_v_custom_diffusion.weight.dtype) + ) + key = key.to(attn.to_q.weight.dtype) + value = value.to(attn.to_q.weight.dtype) + else: + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + if crossattn: + detach = torch.ones_like(key) + detach[:, :1, :] = detach[:, :1, :] * 0.0 + key = detach * key + (1 - detach) * key.detach() + value = detach * value + (1 - detach) * value.detach() + + query = attn.head_to_batch_dim(query).contiguous() + key = attn.head_to_batch_dim(key).contiguous() + value = attn.head_to_batch_dim(value).contiguous() + + hidden_states = xformers.ops.memory_efficient_attention( + query, + key, + value, + attn_bias=attention_mask, + op=self.attention_op, + scale=attn.scale, + ) + hidden_states = hidden_states.to(query.dtype) + hidden_states = attn.batch_to_head_dim(hidden_states) + + if self.train_q_out: + # linear proj + hidden_states = self.to_out_custom_diffusion[0](hidden_states) + # dropout + hidden_states = self.to_out_custom_diffusion[1](hidden_states) + else: + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + return hidden_states + + +class CustomDiffusionAttnProcessor2_0(nn.Module): + r""" + Processor for implementing attention for the Custom Diffusion method using PyTorch 2.0’s memory-efficient scaled + dot-product attention. + + Args: + train_kv (`bool`, defaults to `True`): + Whether to newly train the key and value matrices corresponding to the text features. + train_q_out (`bool`, defaults to `True`): + Whether to newly train query matrices corresponding to the latent image features. + hidden_size (`int`, *optional*, defaults to `None`): + The hidden size of the attention layer. + cross_attention_dim (`int`, *optional*, defaults to `None`): + The number of channels in the `encoder_hidden_states`. + out_bias (`bool`, defaults to `True`): + Whether to include the bias parameter in `train_q_out`. + dropout (`float`, *optional*, defaults to 0.0): + The dropout probability to use. + """ + + def __init__( + self, + train_kv: bool = True, + train_q_out: bool = True, + hidden_size: Optional[int] = None, + cross_attention_dim: Optional[int] = None, + out_bias: bool = True, + dropout: float = 0.0, + ): + super().__init__() + self.train_kv = train_kv + self.train_q_out = train_q_out + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + + # `_custom_diffusion` id for easy serialization and loading. + if self.train_kv: + self.to_k_custom_diffusion = nn.Linear( + cross_attention_dim or hidden_size, hidden_size, bias=False + ) + self.to_v_custom_diffusion = nn.Linear( + cross_attention_dim or hidden_size, hidden_size, bias=False + ) + if self.train_q_out: + self.to_q_custom_diffusion = nn.Linear(hidden_size, hidden_size, bias=False) + self.to_out_custom_diffusion = nn.ModuleList([]) + self.to_out_custom_diffusion.append( + nn.Linear(hidden_size, hidden_size, bias=out_bias) + ) + self.to_out_custom_diffusion.append(nn.Dropout(dropout)) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + ) -> torch.Tensor: + batch_size, sequence_length, _ = hidden_states.shape + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + if self.train_q_out: + query = self.to_q_custom_diffusion(hidden_states) + else: + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + crossattn = False + encoder_hidden_states = hidden_states + else: + crossattn = True + if attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + if self.train_kv: + key = self.to_k_custom_diffusion( + encoder_hidden_states.to(self.to_k_custom_diffusion.weight.dtype) + ) + value = self.to_v_custom_diffusion( + encoder_hidden_states.to(self.to_v_custom_diffusion.weight.dtype) + ) + key = key.to(attn.to_q.weight.dtype) + value = value.to(attn.to_q.weight.dtype) + + else: + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + if crossattn: + detach = torch.ones_like(key) + detach[:, :1, :] = detach[:, :1, :] * 0.0 + key = detach * key + (1 - detach) * key.detach() + value = detach * value + (1 - detach) * value.detach() + + inner_dim = hidden_states.shape[-1] + + head_dim = inner_dim // attn.heads + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False + ) + + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + if self.train_q_out: + # linear proj + hidden_states = self.to_out_custom_diffusion[0](hidden_states) + # dropout + hidden_states = self.to_out_custom_diffusion[1](hidden_states) + else: + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + return hidden_states + + +class SlicedAttnProcessor: + r""" + Processor for implementing sliced attention. + + Args: + slice_size (`int`, *optional*): + The number of steps to compute attention. Uses as many slices as `attention_head_dim // slice_size`, and + `attention_head_dim` must be a multiple of the `slice_size`. + """ + + def __init__(self, slice_size: int): + self.slice_size = slice_size + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + ) -> torch.Tensor: + residual = hidden_states + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + dim = query.shape[-1] + query = attn.head_to_batch_dim(query) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + key = attn.head_to_batch_dim(key) + value = attn.head_to_batch_dim(value) + + batch_size_attention, query_tokens, _ = query.shape + hidden_states = torch.zeros( + (batch_size_attention, query_tokens, dim // attn.heads), + device=query.device, + dtype=query.dtype, + ) + + for i in range(batch_size_attention // self.slice_size): + start_idx = i * self.slice_size + end_idx = (i + 1) * self.slice_size + + query_slice = query[start_idx:end_idx] + key_slice = key[start_idx:end_idx] + attn_mask_slice = ( + attention_mask[start_idx:end_idx] + if attention_mask is not None + else None + ) + + attn_slice = attn.get_attention_scores( + query_slice, key_slice, attn_mask_slice + ) + + attn_slice = torch.bmm(attn_slice, value[start_idx:end_idx]) + + hidden_states[start_idx:end_idx] = attn_slice + + hidden_states = attn.batch_to_head_dim(hidden_states) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class SlicedAttnAddedKVProcessor: + r""" + Processor for implementing sliced attention with extra learnable key and value matrices for the text encoder. + + Args: + slice_size (`int`, *optional*): + The number of steps to compute attention. Uses as many slices as `attention_head_dim // slice_size`, and + `attention_head_dim` must be a multiple of the `slice_size`. + """ + + def __init__(self, slice_size): + self.slice_size = slice_size + + def __call__( + self, + attn: "Attention", + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + ) -> torch.Tensor: + residual = hidden_states + + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + hidden_states = hidden_states.view( + hidden_states.shape[0], hidden_states.shape[1], -1 + ).transpose(1, 2) + + batch_size, sequence_length, _ = hidden_states.shape + + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose(1, 2) + + query = attn.to_q(hidden_states) + dim = query.shape[-1] + query = attn.head_to_batch_dim(query) + + encoder_hidden_states_key_proj = attn.add_k_proj(encoder_hidden_states) + encoder_hidden_states_value_proj = attn.add_v_proj(encoder_hidden_states) + + encoder_hidden_states_key_proj = attn.head_to_batch_dim( + encoder_hidden_states_key_proj + ) + encoder_hidden_states_value_proj = attn.head_to_batch_dim( + encoder_hidden_states_value_proj + ) + + if not attn.only_cross_attention: + key = attn.to_k(hidden_states) + value = attn.to_v(hidden_states) + key = attn.head_to_batch_dim(key) + value = attn.head_to_batch_dim(value) + key = torch.cat([encoder_hidden_states_key_proj, key], dim=1) + value = torch.cat([encoder_hidden_states_value_proj, value], dim=1) + else: + key = encoder_hidden_states_key_proj + value = encoder_hidden_states_value_proj + + batch_size_attention, query_tokens, _ = query.shape + hidden_states = torch.zeros( + (batch_size_attention, query_tokens, dim // attn.heads), + device=query.device, + dtype=query.dtype, + ) + + for i in range(batch_size_attention // self.slice_size): + start_idx = i * self.slice_size + end_idx = (i + 1) * self.slice_size + + query_slice = query[start_idx:end_idx] + key_slice = key[start_idx:end_idx] + attn_mask_slice = ( + attention_mask[start_idx:end_idx] + if attention_mask is not None + else None + ) + + attn_slice = attn.get_attention_scores( + query_slice, key_slice, attn_mask_slice + ) + + attn_slice = torch.bmm(attn_slice, value[start_idx:end_idx]) + + hidden_states[start_idx:end_idx] = attn_slice + + hidden_states = attn.batch_to_head_dim(hidden_states) + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + hidden_states = hidden_states.transpose(-1, -2).reshape(residual.shape) + hidden_states = hidden_states + residual + + return hidden_states + + +class SpatialNorm(nn.Module): + """ + Spatially conditioned normalization as defined in https://arxiv.org/abs/2209.09002. + + Args: + f_channels (`int`): + The number of channels for input to group normalization layer, and output of the spatial norm layer. + zq_channels (`int`): + The number of channels for the quantized vector as described in the paper. + """ + + def __init__( + self, + f_channels: int, + zq_channels: int, + ): + super().__init__() + self.norm_layer = nn.GroupNorm( + num_channels=f_channels, num_groups=32, eps=1e-6, affine=True + ) + self.conv_y = nn.Conv2d( + zq_channels, f_channels, kernel_size=1, stride=1, padding=0 + ) + self.conv_b = nn.Conv2d( + zq_channels, f_channels, kernel_size=1, stride=1, padding=0 + ) + + def forward(self, f: torch.Tensor, zq: torch.Tensor) -> torch.Tensor: + f_size = f.shape[-2:] + zq = F.interpolate(zq, size=f_size, mode="nearest") + norm_f = self.norm_layer(f) + new_f = norm_f * self.conv_y(zq) + self.conv_b(zq) + return new_f + + +class LoRAAttnProcessor(nn.Module): + def __init__( + self, + hidden_size: int, + cross_attention_dim: Optional[int] = None, + rank: int = 4, + network_alpha: Optional[int] = None, + **kwargs, + ): + deprecation_message = "Using LoRAAttnProcessor is deprecated. Please use the PEFT backend for all things LoRA. You can install PEFT by running `pip install peft`." + deprecate( + "LoRAAttnProcessor", "0.30.0", deprecation_message, standard_warn=False + ) + + super().__init__() + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + self.rank = rank + + q_rank = kwargs.pop("q_rank", None) + q_hidden_size = kwargs.pop("q_hidden_size", None) + q_rank = q_rank if q_rank is not None else rank + q_hidden_size = q_hidden_size if q_hidden_size is not None else hidden_size + + v_rank = kwargs.pop("v_rank", None) + v_hidden_size = kwargs.pop("v_hidden_size", None) + v_rank = v_rank if v_rank is not None else rank + v_hidden_size = v_hidden_size if v_hidden_size is not None else hidden_size + + out_rank = kwargs.pop("out_rank", None) + out_hidden_size = kwargs.pop("out_hidden_size", None) + out_rank = out_rank if out_rank is not None else rank + out_hidden_size = ( + out_hidden_size if out_hidden_size is not None else hidden_size + ) + + self.to_q_lora = LoRALinearLayer( + q_hidden_size, q_hidden_size, q_rank, network_alpha + ) + self.to_k_lora = LoRALinearLayer( + cross_attention_dim or hidden_size, hidden_size, rank, network_alpha + ) + self.to_v_lora = LoRALinearLayer( + cross_attention_dim or v_hidden_size, v_hidden_size, v_rank, network_alpha + ) + self.to_out_lora = LoRALinearLayer( + out_hidden_size, out_hidden_size, out_rank, network_alpha + ) + + def __call__( + self, attn: Attention, hidden_states: torch.Tensor, **kwargs + ) -> torch.Tensor: + self_cls_name = self.__class__.__name__ + deprecate( + self_cls_name, + "0.26.0", + ( + f"Make sure use {self_cls_name[4:]} instead by setting" + "LoRA layers to `self.{to_q,to_k,to_v,to_out[0]}.lora_layer` respectively. This will be done automatically when using" + " `LoraLoaderMixin.load_lora_weights`" + ), + ) + attn.to_q.lora_layer = self.to_q_lora.to(hidden_states.device) + attn.to_k.lora_layer = self.to_k_lora.to(hidden_states.device) + attn.to_v.lora_layer = self.to_v_lora.to(hidden_states.device) + attn.to_out[0].lora_layer = self.to_out_lora.to(hidden_states.device) + + attn._modules.pop("processor") + attn.processor = AttnProcessor() + return attn.processor(attn, hidden_states, **kwargs) + + +class LoRAAttnProcessor2_0(nn.Module): + def __init__( + self, + hidden_size: int, + cross_attention_dim: Optional[int] = None, + rank: int = 4, + network_alpha: Optional[int] = None, + **kwargs, + ): + deprecation_message = "Using LoRAAttnProcessor is deprecated. Please use the PEFT backend for all things LoRA. You can install PEFT by running `pip install peft`." + deprecate( + "LoRAAttnProcessor2_0", "0.30.0", deprecation_message, standard_warn=False + ) + + super().__init__() + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + "AttnProcessor2_0 requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + self.rank = rank + + q_rank = kwargs.pop("q_rank", None) + q_hidden_size = kwargs.pop("q_hidden_size", None) + q_rank = q_rank if q_rank is not None else rank + q_hidden_size = q_hidden_size if q_hidden_size is not None else hidden_size + + v_rank = kwargs.pop("v_rank", None) + v_hidden_size = kwargs.pop("v_hidden_size", None) + v_rank = v_rank if v_rank is not None else rank + v_hidden_size = v_hidden_size if v_hidden_size is not None else hidden_size + + out_rank = kwargs.pop("out_rank", None) + out_hidden_size = kwargs.pop("out_hidden_size", None) + out_rank = out_rank if out_rank is not None else rank + out_hidden_size = ( + out_hidden_size if out_hidden_size is not None else hidden_size + ) + + self.to_q_lora = LoRALinearLayer( + q_hidden_size, q_hidden_size, q_rank, network_alpha + ) + self.to_k_lora = LoRALinearLayer( + cross_attention_dim or hidden_size, hidden_size, rank, network_alpha + ) + self.to_v_lora = LoRALinearLayer( + cross_attention_dim or v_hidden_size, v_hidden_size, v_rank, network_alpha + ) + self.to_out_lora = LoRALinearLayer( + out_hidden_size, out_hidden_size, out_rank, network_alpha + ) + + def __call__( + self, attn: Attention, hidden_states: torch.Tensor, **kwargs + ) -> torch.Tensor: + self_cls_name = self.__class__.__name__ + deprecate( + self_cls_name, + "0.26.0", + ( + f"Make sure use {self_cls_name[4:]} instead by setting" + "LoRA layers to `self.{to_q,to_k,to_v,to_out[0]}.lora_layer` respectively. This will be done automatically when using" + " `LoraLoaderMixin.load_lora_weights`" + ), + ) + attn.to_q.lora_layer = self.to_q_lora.to(hidden_states.device) + attn.to_k.lora_layer = self.to_k_lora.to(hidden_states.device) + attn.to_v.lora_layer = self.to_v_lora.to(hidden_states.device) + attn.to_out[0].lora_layer = self.to_out_lora.to(hidden_states.device) + + attn._modules.pop("processor") + attn.processor = AttnProcessor2_0() + return attn.processor(attn, hidden_states, **kwargs) + + +class LoRAXFormersAttnProcessor(nn.Module): + r""" + Processor for implementing the LoRA attention mechanism with memory efficient attention using xFormers. + + Args: + hidden_size (`int`, *optional*): + The hidden size of the attention layer. + cross_attention_dim (`int`, *optional*): + The number of channels in the `encoder_hidden_states`. + rank (`int`, defaults to 4): + The dimension of the LoRA update matrices. + attention_op (`Callable`, *optional*, defaults to `None`): + The base + [operator](https://facebookresearch.github.io/xformers/components/ops.html#xformers.ops.AttentionOpBase) to + use as the attention operator. It is recommended to set to `None`, and allow xFormers to choose the best + operator. + network_alpha (`int`, *optional*): + Equivalent to `alpha` but it's usage is specific to Kohya (A1111) style LoRAs. + kwargs (`dict`): + Additional keyword arguments to pass to the `LoRALinearLayer` layers. + """ + + def __init__( + self, + hidden_size: int, + cross_attention_dim: int, + rank: int = 4, + attention_op: Optional[Callable] = None, + network_alpha: Optional[int] = None, + **kwargs, + ): + super().__init__() + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + self.rank = rank + self.attention_op = attention_op + + q_rank = kwargs.pop("q_rank", None) + q_hidden_size = kwargs.pop("q_hidden_size", None) + q_rank = q_rank if q_rank is not None else rank + q_hidden_size = q_hidden_size if q_hidden_size is not None else hidden_size + + v_rank = kwargs.pop("v_rank", None) + v_hidden_size = kwargs.pop("v_hidden_size", None) + v_rank = v_rank if v_rank is not None else rank + v_hidden_size = v_hidden_size if v_hidden_size is not None else hidden_size + + out_rank = kwargs.pop("out_rank", None) + out_hidden_size = kwargs.pop("out_hidden_size", None) + out_rank = out_rank if out_rank is not None else rank + out_hidden_size = ( + out_hidden_size if out_hidden_size is not None else hidden_size + ) + + self.to_q_lora = LoRALinearLayer( + q_hidden_size, q_hidden_size, q_rank, network_alpha + ) + self.to_k_lora = LoRALinearLayer( + cross_attention_dim or hidden_size, hidden_size, rank, network_alpha + ) + self.to_v_lora = LoRALinearLayer( + cross_attention_dim or v_hidden_size, v_hidden_size, v_rank, network_alpha + ) + self.to_out_lora = LoRALinearLayer( + out_hidden_size, out_hidden_size, out_rank, network_alpha + ) + + def __call__( + self, attn: Attention, hidden_states: torch.Tensor, **kwargs + ) -> torch.Tensor: + self_cls_name = self.__class__.__name__ + deprecate( + self_cls_name, + "0.26.0", + ( + f"Make sure use {self_cls_name[4:]} instead by setting" + "LoRA layers to `self.{to_q,to_k,to_v,add_k_proj,add_v_proj,to_out[0]}.lora_layer` respectively. This will be done automatically when using" + " `LoraLoaderMixin.load_lora_weights`" + ), + ) + attn.to_q.lora_layer = self.to_q_lora.to(hidden_states.device) + attn.to_k.lora_layer = self.to_k_lora.to(hidden_states.device) + attn.to_v.lora_layer = self.to_v_lora.to(hidden_states.device) + attn.to_out[0].lora_layer = self.to_out_lora.to(hidden_states.device) + + attn._modules.pop("processor") + attn.processor = XFormersAttnProcessor() + return attn.processor(attn, hidden_states, **kwargs) + + +class LoRAAttnAddedKVProcessor(nn.Module): + r""" + Processor for implementing the LoRA attention mechanism with extra learnable key and value matrices for the text + encoder. + + Args: + hidden_size (`int`, *optional*): + The hidden size of the attention layer. + cross_attention_dim (`int`, *optional*, defaults to `None`): + The number of channels in the `encoder_hidden_states`. + rank (`int`, defaults to 4): + The dimension of the LoRA update matrices. + network_alpha (`int`, *optional*): + Equivalent to `alpha` but it's usage is specific to Kohya (A1111) style LoRAs. + kwargs (`dict`): + Additional keyword arguments to pass to the `LoRALinearLayer` layers. + """ + + def __init__( + self, + hidden_size: int, + cross_attention_dim: Optional[int] = None, + rank: int = 4, + network_alpha: Optional[int] = None, + ): + super().__init__() + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + self.rank = rank + + self.to_q_lora = LoRALinearLayer(hidden_size, hidden_size, rank, network_alpha) + self.add_k_proj_lora = LoRALinearLayer( + cross_attention_dim or hidden_size, hidden_size, rank, network_alpha + ) + self.add_v_proj_lora = LoRALinearLayer( + cross_attention_dim or hidden_size, hidden_size, rank, network_alpha + ) + self.to_k_lora = LoRALinearLayer(hidden_size, hidden_size, rank, network_alpha) + self.to_v_lora = LoRALinearLayer(hidden_size, hidden_size, rank, network_alpha) + self.to_out_lora = LoRALinearLayer( + hidden_size, hidden_size, rank, network_alpha + ) + + def __call__( + self, attn: Attention, hidden_states: torch.Tensor, **kwargs + ) -> torch.Tensor: + self_cls_name = self.__class__.__name__ + deprecate( + self_cls_name, + "0.26.0", + ( + f"Make sure use {self_cls_name[4:]} instead by setting" + "LoRA layers to `self.{to_q,to_k,to_v,add_k_proj,add_v_proj,to_out[0]}.lora_layer` respectively. This will be done automatically when using" + " `LoraLoaderMixin.load_lora_weights`" + ), + ) + attn.to_q.lora_layer = self.to_q_lora.to(hidden_states.device) + attn.to_k.lora_layer = self.to_k_lora.to(hidden_states.device) + attn.to_v.lora_layer = self.to_v_lora.to(hidden_states.device) + attn.to_out[0].lora_layer = self.to_out_lora.to(hidden_states.device) + + attn._modules.pop("processor") + attn.processor = AttnAddedKVProcessor() + return attn.processor(attn, hidden_states, **kwargs) + + +class IPAdapterAttnProcessor(nn.Module): + r""" + Attention processor for Multiple IP-Adapters. + + Args: + hidden_size (`int`): + The hidden size of the attention layer. + cross_attention_dim (`int`): + The number of channels in the `encoder_hidden_states`. + num_tokens (`int`, `Tuple[int]` or `List[int]`, defaults to `(4,)`): + The context length of the image features. + scale (`float` or List[`float`], defaults to 1.0): + the weight scale of image prompt. + """ + + def __init__( + self, hidden_size, cross_attention_dim=None, num_tokens=(4,), scale=1.0 + ): + super().__init__() + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + + if not isinstance(num_tokens, (tuple, list)): + num_tokens = [num_tokens] + self.num_tokens = num_tokens + + if not isinstance(scale, list): + scale = [scale] * len(num_tokens) + if len(scale) != len(num_tokens): + raise ValueError( + "`scale` should be a list of integers with the same length as `num_tokens`." + ) + self.scale = scale + + self.to_k_ip = nn.ModuleList( + [ + nn.Linear(cross_attention_dim, hidden_size, bias=False) + for _ in range(len(num_tokens)) + ] + ) + self.to_v_ip = nn.ModuleList( + [ + nn.Linear(cross_attention_dim, hidden_size, bias=False) + for _ in range(len(num_tokens)) + ] + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + scale: float = 1.0, + ip_adapter_masks: Optional[torch.Tensor] = None, + ): + residual = hidden_states + + # separate ip_hidden_states from encoder_hidden_states + if encoder_hidden_states is not None: + if isinstance(encoder_hidden_states, tuple): + encoder_hidden_states, ip_hidden_states = encoder_hidden_states + else: + deprecation_message = ( + "You have passed a tensor as `encoder_hidden_states`. This is deprecated and will be removed in a future release." + " Please make sure to update your script to pass `encoder_hidden_states` as a tuple to suppress this warning." + ) + deprecate( + "encoder_hidden_states not a tuple", + "1.0.0", + deprecation_message, + standard_warn=False, + ) + end_pos = encoder_hidden_states.shape[1] - self.num_tokens[0] + encoder_hidden_states, ip_hidden_states = ( + encoder_hidden_states[:, :end_pos, :], + [encoder_hidden_states[:, end_pos:, :]], + ) + + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + query = attn.head_to_batch_dim(query) + key = attn.head_to_batch_dim(key) + value = attn.head_to_batch_dim(value) + + attention_probs = attn.get_attention_scores(query, key, attention_mask) + hidden_states = torch.bmm(attention_probs, value) + hidden_states = attn.batch_to_head_dim(hidden_states) + + if ip_adapter_masks is not None: + if not isinstance(ip_adapter_masks, List): + # for backward compatibility, we accept `ip_adapter_mask` as a tensor of shape [num_ip_adapter, 1, height, width] + ip_adapter_masks = list(ip_adapter_masks.unsqueeze(1)) + if not (len(ip_adapter_masks) == len(self.scale) == len(ip_hidden_states)): + raise ValueError( + f"Length of ip_adapter_masks array ({len(ip_adapter_masks)}) must match " + f"length of self.scale array ({len(self.scale)}) and number of ip_hidden_states " + f"({len(ip_hidden_states)})" + ) + else: + for index, (mask, scale, ip_state) in enumerate( + zip(ip_adapter_masks, self.scale, ip_hidden_states) + ): + if not isinstance(mask, torch.Tensor) or mask.ndim != 4: + raise ValueError( + "Each element of the ip_adapter_masks array should be a tensor with shape " + "[1, num_images_for_ip_adapter, height, width]." + " Please use `IPAdapterMaskProcessor` to preprocess your mask" + ) + if mask.shape[1] != ip_state.shape[1]: + raise ValueError( + f"Number of masks ({mask.shape[1]}) does not match " + f"number of ip images ({ip_state.shape[1]}) at index {index}" + ) + if isinstance(scale, list) and not len(scale) == mask.shape[1]: + raise ValueError( + f"Number of masks ({mask.shape[1]}) does not match " + f"number of scales ({len(scale)}) at index {index}" + ) + else: + ip_adapter_masks = [None] * len(self.scale) + + # for ip-adapter + for current_ip_hidden_states, scale, to_k_ip, to_v_ip, mask in zip( + ip_hidden_states, self.scale, self.to_k_ip, self.to_v_ip, ip_adapter_masks + ): + skip = False + if isinstance(scale, list): + if all(s == 0 for s in scale): + skip = True + elif scale == 0: + skip = True + if not skip: + if mask is not None: + if not isinstance(scale, list): + scale = [scale] * mask.shape[1] + + current_num_images = mask.shape[1] + for i in range(current_num_images): + ip_key = to_k_ip(current_ip_hidden_states[:, i, :, :]) + ip_value = to_v_ip(current_ip_hidden_states[:, i, :, :]) + + ip_key = attn.head_to_batch_dim(ip_key) + ip_value = attn.head_to_batch_dim(ip_value) + + ip_attention_probs = attn.get_attention_scores( + query, ip_key, None + ) + _current_ip_hidden_states = torch.bmm( + ip_attention_probs, ip_value + ) + _current_ip_hidden_states = attn.batch_to_head_dim( + _current_ip_hidden_states + ) + + mask_downsample = IPAdapterMaskProcessor.downsample( + mask[:, i, :, :], + batch_size, + _current_ip_hidden_states.shape[1], + _current_ip_hidden_states.shape[2], + ) + + mask_downsample = mask_downsample.to( + dtype=query.dtype, device=query.device + ) + + hidden_states = hidden_states + scale[i] * ( + _current_ip_hidden_states * mask_downsample + ) + else: + ip_key = to_k_ip(current_ip_hidden_states) + ip_value = to_v_ip(current_ip_hidden_states) + + ip_key = attn.head_to_batch_dim(ip_key) + ip_value = attn.head_to_batch_dim(ip_value) + + ip_attention_probs = attn.get_attention_scores(query, ip_key, None) + current_ip_hidden_states = torch.bmm(ip_attention_probs, ip_value) + current_ip_hidden_states = attn.batch_to_head_dim( + current_ip_hidden_states + ) + + hidden_states = hidden_states + scale * current_ip_hidden_states + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +class IPAdapterAttnProcessor2_0(torch.nn.Module): + r""" + Attention processor for IP-Adapter for PyTorch 2.0. + + Args: + hidden_size (`int`): + The hidden size of the attention layer. + cross_attention_dim (`int`): + The number of channels in the `encoder_hidden_states`. + num_tokens (`int`, `Tuple[int]` or `List[int]`, defaults to `(4,)`): + The context length of the image features. + scale (`float` or `List[float]`, defaults to 1.0): + the weight scale of image prompt. + """ + + def __init__( + self, hidden_size, cross_attention_dim=None, num_tokens=(4,), scale=1.0 + ): + super().__init__() + + if not hasattr(F, "scaled_dot_product_attention"): + raise ImportError( + f"{self.__class__.__name__} requires PyTorch 2.0, to use it, please upgrade PyTorch to 2.0." + ) + + self.hidden_size = hidden_size + self.cross_attention_dim = cross_attention_dim + + if not isinstance(num_tokens, (tuple, list)): + num_tokens = [num_tokens] + self.num_tokens = num_tokens + + if not isinstance(scale, list): + scale = [scale] * len(num_tokens) + if len(scale) != len(num_tokens): + raise ValueError( + "`scale` should be a list of integers with the same length as `num_tokens`." + ) + self.scale = scale + + self.to_k_ip = nn.ModuleList( + [ + nn.Linear(cross_attention_dim, hidden_size, bias=False) + for _ in range(len(num_tokens)) + ] + ) + self.to_v_ip = nn.ModuleList( + [ + nn.Linear(cross_attention_dim, hidden_size, bias=False) + for _ in range(len(num_tokens)) + ] + ) + + def __call__( + self, + attn: Attention, + hidden_states: torch.Tensor, + encoder_hidden_states: Optional[torch.Tensor] = None, + attention_mask: Optional[torch.Tensor] = None, + temb: Optional[torch.Tensor] = None, + scale: float = 1.0, + ip_adapter_masks: Optional[torch.Tensor] = None, + ): + residual = hidden_states + + # separate ip_hidden_states from encoder_hidden_states + if encoder_hidden_states is not None: + if isinstance(encoder_hidden_states, tuple): + encoder_hidden_states, ip_hidden_states = encoder_hidden_states + else: + deprecation_message = ( + "You have passed a tensor as `encoder_hidden_states`. This is deprecated and will be removed in a future release." + " Please make sure to update your script to pass `encoder_hidden_states` as a tuple to suppress this warning." + ) + deprecate( + "encoder_hidden_states not a tuple", + "1.0.0", + deprecation_message, + standard_warn=False, + ) + end_pos = encoder_hidden_states.shape[1] - self.num_tokens[0] + encoder_hidden_states, ip_hidden_states = ( + encoder_hidden_states[:, :end_pos, :], + [encoder_hidden_states[:, end_pos:, :]], + ) + + if attn.spatial_norm is not None: + hidden_states = attn.spatial_norm(hidden_states, temb) + + input_ndim = hidden_states.ndim + + if input_ndim == 4: + batch_size, channel, height, width = hidden_states.shape + hidden_states = hidden_states.view( + batch_size, channel, height * width + ).transpose(1, 2) + + batch_size, sequence_length, _ = ( + hidden_states.shape + if encoder_hidden_states is None + else encoder_hidden_states.shape + ) + + if attention_mask is not None: + attention_mask = attn.prepare_attention_mask( + attention_mask, sequence_length, batch_size + ) + # scaled_dot_product_attention expects attention_mask shape to be + # (batch, heads, source_length, target_length) + attention_mask = attention_mask.view( + batch_size, attn.heads, -1, attention_mask.shape[-1] + ) + + if attn.group_norm is not None: + hidden_states = attn.group_norm(hidden_states.transpose(1, 2)).transpose( + 1, 2 + ) + + query = attn.to_q(hidden_states) + + if encoder_hidden_states is None: + encoder_hidden_states = hidden_states + elif attn.norm_cross: + encoder_hidden_states = attn.norm_encoder_hidden_states( + encoder_hidden_states + ) + + key = attn.to_k(encoder_hidden_states) + value = attn.to_v(encoder_hidden_states) + + inner_dim = key.shape[-1] + head_dim = inner_dim // attn.heads + + query = query.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + key = key.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + value = value.view(batch_size, -1, attn.heads, head_dim).transpose(1, 2) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + hidden_states = F.scaled_dot_product_attention( + query, key, value, attn_mask=attention_mask, dropout_p=0.0, is_causal=False + ) + + hidden_states = hidden_states.transpose(1, 2).reshape( + batch_size, -1, attn.heads * head_dim + ) + hidden_states = hidden_states.to(query.dtype) + + if ip_adapter_masks is not None: + if not isinstance(ip_adapter_masks, List): + # for backward compatibility, we accept `ip_adapter_mask` as a tensor of shape [num_ip_adapter, 1, height, width] + ip_adapter_masks = list(ip_adapter_masks.unsqueeze(1)) + if not (len(ip_adapter_masks) == len(self.scale) == len(ip_hidden_states)): + raise ValueError( + f"Length of ip_adapter_masks array ({len(ip_adapter_masks)}) must match " + f"length of self.scale array ({len(self.scale)}) and number of ip_hidden_states " + f"({len(ip_hidden_states)})" + ) + else: + for index, (mask, scale, ip_state) in enumerate( + zip(ip_adapter_masks, self.scale, ip_hidden_states) + ): + if not isinstance(mask, torch.Tensor) or mask.ndim != 4: + raise ValueError( + "Each element of the ip_adapter_masks array should be a tensor with shape " + "[1, num_images_for_ip_adapter, height, width]." + " Please use `IPAdapterMaskProcessor` to preprocess your mask" + ) + if mask.shape[1] != ip_state.shape[1]: + raise ValueError( + f"Number of masks ({mask.shape[1]}) does not match " + f"number of ip images ({ip_state.shape[1]}) at index {index}" + ) + if isinstance(scale, list) and not len(scale) == mask.shape[1]: + raise ValueError( + f"Number of masks ({mask.shape[1]}) does not match " + f"number of scales ({len(scale)}) at index {index}" + ) + else: + ip_adapter_masks = [None] * len(self.scale) + + # for ip-adapter + for current_ip_hidden_states, scale, to_k_ip, to_v_ip, mask in zip( + ip_hidden_states, self.scale, self.to_k_ip, self.to_v_ip, ip_adapter_masks + ): + skip = False + if isinstance(scale, list): + if all(s == 0 for s in scale): + skip = True + elif scale == 0: + skip = True + if not skip: + if mask is not None: + if not isinstance(scale, list): + scale = [scale] * mask.shape[1] + + current_num_images = mask.shape[1] + for i in range(current_num_images): + ip_key = to_k_ip(current_ip_hidden_states[:, i, :, :]) + ip_value = to_v_ip(current_ip_hidden_states[:, i, :, :]) + + ip_key = ip_key.view( + batch_size, -1, attn.heads, head_dim + ).transpose(1, 2) + ip_value = ip_value.view( + batch_size, -1, attn.heads, head_dim + ).transpose(1, 2) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + _current_ip_hidden_states = F.scaled_dot_product_attention( + query, + ip_key, + ip_value, + attn_mask=None, + dropout_p=0.0, + is_causal=False, + ) + + _current_ip_hidden_states = _current_ip_hidden_states.transpose( + 1, 2 + ).reshape(batch_size, -1, attn.heads * head_dim) + _current_ip_hidden_states = _current_ip_hidden_states.to( + query.dtype + ) + + mask_downsample = IPAdapterMaskProcessor.downsample( + mask[:, i, :, :], + batch_size, + _current_ip_hidden_states.shape[1], + _current_ip_hidden_states.shape[2], + ) + + mask_downsample = mask_downsample.to( + dtype=query.dtype, device=query.device + ) + hidden_states = hidden_states + scale[i] * ( + _current_ip_hidden_states * mask_downsample + ) + else: + ip_key = to_k_ip(current_ip_hidden_states) + ip_value = to_v_ip(current_ip_hidden_states) + + ip_key = ip_key.view( + batch_size, -1, attn.heads, head_dim + ).transpose(1, 2) + ip_value = ip_value.view( + batch_size, -1, attn.heads, head_dim + ).transpose(1, 2) + + # the output of sdp = (batch, num_heads, seq_len, head_dim) + # TODO: add support for attn.scale when we move to Torch 2.1 + current_ip_hidden_states = F.scaled_dot_product_attention( + query, + ip_key, + ip_value, + attn_mask=None, + dropout_p=0.0, + is_causal=False, + ) + + current_ip_hidden_states = current_ip_hidden_states.transpose( + 1, 2 + ).reshape(batch_size, -1, attn.heads * head_dim) + current_ip_hidden_states = current_ip_hidden_states.to(query.dtype) + + hidden_states = hidden_states + scale * current_ip_hidden_states + + # linear proj + hidden_states = attn.to_out[0](hidden_states) + # dropout + hidden_states = attn.to_out[1](hidden_states) + + if input_ndim == 4: + hidden_states = hidden_states.transpose(-1, -2).reshape( + batch_size, channel, height, width + ) + + if attn.residual_connection: + hidden_states = hidden_states + residual + + hidden_states = hidden_states / attn.rescale_output_factor + + return hidden_states + + +LORA_ATTENTION_PROCESSORS = ( + LoRAAttnProcessor, + LoRAAttnProcessor2_0, + LoRAXFormersAttnProcessor, + LoRAAttnAddedKVProcessor, +) + +ADDED_KV_ATTENTION_PROCESSORS = ( + AttnAddedKVProcessor, + SlicedAttnAddedKVProcessor, + AttnAddedKVProcessor2_0, + XFormersAttnAddedKVProcessor, + LoRAAttnAddedKVProcessor, +) + +CROSS_ATTENTION_PROCESSORS = ( + AttnProcessor, + AttnProcessor2_0, + XFormersAttnProcessor, + SlicedAttnProcessor, + LoRAAttnProcessor, + LoRAAttnProcessor2_0, + LoRAXFormersAttnProcessor, + IPAdapterAttnProcessor, + IPAdapterAttnProcessor2_0, +) + +AttentionProcessor = Union[ + AttnProcessor, + AttnProcessor2_0, + FusedAttnProcessor2_0, + XFormersAttnProcessor, + SlicedAttnProcessor, + AttnAddedKVProcessor, + SlicedAttnAddedKVProcessor, + AttnAddedKVProcessor2_0, + XFormersAttnAddedKVProcessor, + CustomDiffusionAttnProcessor, + CustomDiffusionXFormersAttnProcessor, + CustomDiffusionAttnProcessor2_0, + # deprecated + LoRAAttnProcessor, + LoRAAttnProcessor2_0, + LoRAXFormersAttnProcessor, + LoRAAttnAddedKVProcessor, +]