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CogVideoX-Fun-V1.1-Reward-LoRAs
Introduction
We explore the Reward Backpropagation technique 1 2 to optimized the generated videos by CogVideoX-Fun-V1.1 for better alignment with human preferences. We provide the following pre-trained models (i.e. LoRAs) along with the training script. You can use these LoRAs to enhance the corresponding base model as a plug-in or train your own reward LoRA.
For more details, please refer to our GitHub repo.
Name | Base Model | Reward Model | Hugging Face | Description |
---|---|---|---|---|
CogVideoX-Fun-V1.1-5b-InP-HPS2.1.safetensors | CogVideoX-Fun-V1.1-5b | HPS v2.1 | 🤗Link | Official HPS v2.1 reward LoRA (rank=128 and network_alpha=64 ) for CogVideoX-Fun-V1.1-5b-InP. It is trained with a batch size of 8 for 1,500 steps. |
CogVideoX-Fun-V1.1-2b-InP-HPS2.1.safetensors | CogVideoX-Fun-V1.1-2b | HPS v2.1 | 🤗Link | Official HPS v2.1 reward LoRA (rank=128 and network_alpha=64 ) for CogVideoX-Fun-V1.1-2b-InP. It is trained with a batch size of 8 for 3,000 steps. |
CogVideoX-Fun-V1.1-5b-InP-MPS.safetensors | CogVideoX-Fun-V1.1-5b | MPS | 🤗Link | Official MPS reward LoRA (rank=128 and network_alpha=64 ) for CogVideoX-Fun-V1.1-5b-InP. It is trained with a batch size of 8 for 5,500 steps. |
CogVideoX-Fun-V1.1-2b-InP-MPS.safetensors | CogVideoX-Fun-V1.1-2b | MPS | 🤗Link | Official MPS reward LoRA (rank=128 and network_alpha=64 ) for CogVideoX-Fun-V1.1-2b-InP. It is trained with a batch size of 8 for 16,000 steps. |
Demo
CogVideoX-Fun-V1.1-5B
Prompt | CogVideoX-Fun-V1.1-5B | CogVideoX-Fun-V1.1-5B HPSv2.1 Reward LoRA |
CogVideoX-Fun-V1.1-5B MPS Reward LoRA |
---|---|---|---|
Pig with wings flying above a diamond mountain | |||
A dog runs through a field while a cat climbs a tree | |||
Crystal cake shimmering beside a metal apple | |||
Elderly artist with a white beard painting on a white canvas |
CogVideoX-Fun-V1.1-2B
Prompt | CogVideoX-Fun-V1.1-2B | CogVideoX-Fun-V1.1-2B HPSv2.1 Reward LoRA |
CogVideoX-Fun-V1.1-2B MPS Reward LoRA |
---|---|---|---|
A blue car drives past a white picket fence on a sunny day | |||
Blue jay swooping near a red maple tree | |||
Yellow curtains swaying near a blue sofa | |||
White tractor plowing near a green farmhouse |
The above test prompts are from T2V-CompBench. All videos are generated with lora weight 0.7.
Quick Start
We provide a simple inference code to run CogVideoX-Fun-V1.1-5b-InP with its HPS2.1 reward LoRA.
import torch
from diffusers import CogVideoXDDIMScheduler
from cogvideox.models.transformer3d import CogVideoXTransformer3DModel
from cogvideox.pipeline.pipeline_cogvideox_inpaint import CogVideoX_Fun_Pipeline_Inpaint
from cogvideox.utils.lora_utils import merge_lora
from cogvideox.utils.utils import get_image_to_video_latent, save_videos_grid
model_path = "alibaba-pai/CogVideoX-Fun-V1.1-5b-InP"
lora_path = "alibaba-pai/CogVideoX-Fun-V1.1-Reward-LoRAs/CogVideoX-Fun-V1.1-5b-InP-HPS2.1.safetensors"
lora_weight = 0.7
prompt = "Pig with wings flying above a diamond mountain"
sample_size = [512, 512]
video_length = 49
transformer = CogVideoXTransformer3DModel.from_pretrained_2d(model_path, subfolder="transformer").to(torch.bfloat16)
scheduler = CogVideoXDDIMScheduler.from_pretrained(model_path, subfolder="scheduler")
pipeline = CogVideoX_Fun_Pipeline_Inpaint.from_pretrained(
model_path, transformer=transformer, scheduler=scheduler, torch_dtype=torch.bfloat16
)
pipeline.enable_model_cpu_offload()
pipeline = merge_lora(pipeline, lora_path, lora_weight)
generator = torch.Generator(device="cuda").manual_seed(42)
input_video, input_video_mask, _ = get_image_to_video_latent(None, None, video_length=video_length, sample_size=sample_size)
sample = pipeline(
prompt,
num_frames = video_length,
negative_prompt = "bad detailed",
height = sample_size[0],
width = sample_size[1],
generator = generator,
guidance_scale = 7.0,
num_inference_steps = 50,
video = input_video,
mask_video = input_video_mask,
).videos
save_videos_grid(sample, "samples/output.mp4", fps=8)
Limitations
- We observe after training to a certain extent, the reward continues to increase, but the quality of the generated videos does not further improve. The model trickly learns some shortcuts (by adding artifacts in the background, i.e., adversarial patches) to increase the reward.
- Currently, there is still a lack of suitable preference models for video generation. Directly using image preference models cannot evaluate preferences along the temporal dimension (such as dynamism and consistency). Further more, We find using image preference models leads to a decrease in the dynamism of generated videos. Although this can be mitigated by computing the reward using only the first frame of the decoded video, the impact still persists.
Reference
- Clark, Kevin, et al. "Directly fine-tuning diffusion models on differentiable rewards.". In ICLR 2024.
- Prabhudesai, Mihir, et al. "Aligning text-to-image diffusion models with reward backpropagation." arXiv preprint arXiv:2310.03739 (2023).