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VIDM: Video Implicit Diffusion Models

Kangfu Mei and Vishal M. Patel, Johns Hopkins University, MD, USA

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Abstract: Diffusion models have emerged as a powerful generative method for synthesizing high-quality and diverse set of images. In this paper, we propose a video generation method based on diffusion models, where the effects of motion are modeled in an implicit condition manner, i.e. one can sample plausible video motions according to the latent feature of frames. We improve the quality of the generated videos by proposing multiple strategies such as sampling space truncation, robustness penalty, and positional group normalization. Various experiments are conducted on datasets consisting of videos with different resolutions and different number of frames. Results show that the proposed method outperforms the state-of-the-art generative adversarial networkbased methods byasignificant margin in terms of FVDscores as well as perceptible visual quality.

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Network Architecture

<img src = "https://i.imgur.com/1mxuYjP.png">

Installation

The model is built in PyTorch 1.8.0 with Python3.8 and CUDA11.6.

For installing, follow these intructions

# get the development directory
git clone git@github.com:MKFMIKU/VIDM.git
cd VIDM

# install the required packages
conda env create -p envs --file environment.yml
conda activate ./envs/

# instal pytorch according to https://pytorch.org/
pip3 install torch torchvision torchaudio

# install the guided_diffusion in its P2-weighting variant according to https://github.com/jychoi118/P2-weighting
git clone https://github.com/jychoi118/P2-weighting.git
cd P2-weighting
pip install -e .
cd ../

# install the mmmmediting according to https://github.com/open-mmlab/mmediting#installation
pip3 install openmim
mim install mmcv-full
git clone https://github.com/open-mmlab/mmediting.git
cd mmediting
pip3 install -e .
cd ../

# install the development directory
pip3 install -e .

Training

  1. To download CLEVRER dataset and split videos into frames, run
chmod a+x scripts/download_clevr_dataset.sh
./scripts/download_clevr_dataset.sh
  1. To train VIDM and motion latent encoder with default settings, run
CUDA_VISIBLE_DEVICES=0,1,2,3 python diffusion_ddp_accum_constant_cu.py --multiprocessing-distributed --world-size 1 --rank 0 --batch-size 48 --workers 24

Note: The above training script uses all GPUs by default. You can control the to-be-used GPUs by setting the CUDA_VISIBLE_DEVICES variable. The batch-szie and workers are the total numbers, which will be divied by the number of GPUs inner the training script.

Testing

  1. Download the pre-trained model and place it in ./pretrained_models/
curl https://www.cis.jhu.edu/~kmei1/share/vidm/checkpoints/checkpoint_accum_clevrer_robust_400000.pth.tar -o pretrained_models/checkpoint_accum_clevrer_robust_400000.pth.tar

  1. Generate video contents or using the extracted first video frames

  2. Testing

CUDA_VISIBLE_DEVICES=0,1,2,3 python diffusion_ddp_accum_constant_cu.py --multiprocessing-distributed --world-size 1 --rank 0 --batch-size 48 --workers 24

Evaluation

For Frechet Video Distance (FVD) and Video Inception Score (VIS) evaluation, we use the reproduced pytorch implementation of StyleGAN-V, which can be easily called as

# For FVD
python scripts/evaluate_FVD.py -dir1 path/to/a/ -dir2 path/to/b/ -b 2 -r 32 -n 128 -ns 16 -i3d ./experiments/i3d_torchscript.pt

# For VIS
python scripts/evaluate_VIS.py -dir2 ../../datasets/webvid/data/frames/b/ -b 1 -r 128 -n 16 -ns 64 -c3d ./experiments/c3d_ucf101.pt

Note that the previous work like DIGAN also reported VIS but they simply stated it as IS.

Please refer to frechet_video_distance.py and video_inception_score.py for the exact details. The used detector weights are available at https://www.dropbox.com/s/ge9e5ujwgetktms/i3d_torchscript.pt?dl=1 and https://www.dropbox.com/s/jxpu7avzdc9n97q/c3d_ucf101.pt?dl=1.