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| ''' | |
| Based on | |
| https://github.com/abetlen/llama-cpp-python | |
| Documentation: | |
| https://abetlen.github.io/llama-cpp-python/ | |
| ''' | |
| import re | |
| from functools import partial | |
| import torch | |
| from modules import shared | |
| from modules.callbacks import Iteratorize | |
| from modules.logging_colors import logger | |
| if torch.cuda.is_available(): | |
| from llama_cpp_cuda import Llama, LlamaCache, LogitsProcessorList | |
| else: | |
| from llama_cpp import Llama, LlamaCache, LogitsProcessorList | |
| def ban_eos_logits_processor(eos_token, input_ids, logits): | |
| logits[eos_token] = -float('inf') | |
| return logits | |
| class LlamaCppModel: | |
| def __init__(self): | |
| self.initialized = False | |
| def __del__(self): | |
| self.model.__del__() | |
| def from_pretrained(self, path): | |
| result = self() | |
| cache_capacity = 0 | |
| if shared.args.cache_capacity is not None: | |
| if 'GiB' in shared.args.cache_capacity: | |
| cache_capacity = int(re.sub('[a-zA-Z]', '', shared.args.cache_capacity)) * 1000 * 1000 * 1000 | |
| elif 'MiB' in shared.args.cache_capacity: | |
| cache_capacity = int(re.sub('[a-zA-Z]', '', shared.args.cache_capacity)) * 1000 * 1000 | |
| else: | |
| cache_capacity = int(shared.args.cache_capacity) | |
| logger.info("Cache capacity is " + str(cache_capacity) + " bytes") | |
| params = { | |
| 'model_path': str(path), | |
| 'n_ctx': shared.args.n_ctx, | |
| 'seed': int(shared.args.llama_cpp_seed), | |
| 'n_threads': shared.args.threads or None, | |
| 'n_batch': shared.args.n_batch, | |
| 'use_mmap': not shared.args.no_mmap, | |
| 'use_mlock': shared.args.mlock, | |
| 'low_vram': shared.args.low_vram, | |
| 'n_gpu_layers': shared.args.n_gpu_layers, | |
| 'rope_freq_base': 10000 * shared.args.alpha_value ** (64/63.), | |
| 'rope_freq_scale': 1.0 / shared.args.compress_pos_emb, | |
| } | |
| result.model = Llama(**params) | |
| if cache_capacity > 0: | |
| result.model.set_cache(LlamaCache(capacity_bytes=cache_capacity)) | |
| # This is ugly, but the model and the tokenizer are the same object in this library. | |
| return result, result | |
| def encode(self, string): | |
| if type(string) is str: | |
| string = string.encode() | |
| return self.model.tokenize(string) | |
| def decode(self, tokens): | |
| return self.model.detokenize(tokens) | |
| def generate(self, prompt, state, callback=None): | |
| prompt = prompt if type(prompt) is str else prompt.decode() | |
| completion_chunks = self.model.create_completion( | |
| prompt=prompt, | |
| max_tokens=state['max_new_tokens'], | |
| temperature=state['temperature'], | |
| top_p=state['top_p'], | |
| top_k=state['top_k'], | |
| repeat_penalty=state['repetition_penalty'], | |
| tfs_z=state['tfs'], | |
| mirostat_mode=int(state['mirostat_mode']), | |
| mirostat_tau=state['mirostat_tau'], | |
| mirostat_eta=state['mirostat_eta'], | |
| stream=True, | |
| logits_processor=LogitsProcessorList([ | |
| partial(ban_eos_logits_processor, self.model.token_eos()), | |
| ]) if state['ban_eos_token'] else None, | |
| ) | |
| output = "" | |
| for completion_chunk in completion_chunks: | |
| text = completion_chunk['choices'][0]['text'] | |
| output += text | |
| if callback: | |
| callback(text) | |
| return output | |
| def generate_with_streaming(self, *args, **kwargs): | |
| with Iteratorize(self.generate, args, kwargs, callback=None) as generator: | |
| reply = '' | |
| for token in generator: | |
| reply += token | |
| yield reply | |