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MemFlow

Website | Paper | Supplementary

MemFlow: Optical Flow Estimation and Prediction with Memory
Qiaole Dong, Yanwei Fu
CVPR 2024

Requirements

conda create --name memflow python=3.8
conda activate memflow
conda install pytorch==1.13.1 torchvision==0.14.1 torchaudio==0.13.1 pytorch-cuda=11.6 -c pytorch -c nvidia
pip install yacs loguru einops timm==0.4.12 imageio matplotlib tensorboard scipy opencv-python h5py tqdm

For training the model, you should further install the FlashAttention.

Models

We provide pretrained models. The default path of the models for evaluation is:

├── ckpts
    ├── MemFlowNet_things.pth
    ├── MemFlowNet_sintel.pth
    ├── MemFlowNet_kitti.pth
    ├── MemFlowNet_spring.pth
    ├── MemFlowNet_T_things.pth
    ├── MemFlowNet_T_things_kitti.pth
    ├── MemFlowNet_T_sintel.pth
    ├── MemFlowNet_T_kitti.pth
    ├── MemFlowNet_P_things.pth
    ├── MemFlowNet_P_sintel.pth

Demos

Download models and put them in the ckpts folder. Run the following command:

python -u inference.py --name MemFlowNet --stage sintel --restore_ckpt ckpts/MemFlowNet_sintel.pth --seq_dir demo_input_images --vis_dir demo_flow_vis

Note: you can change the _CN.val_decoder_depth of configs/sintel_memflownet.py from 15 to smaller numbers for better speed and performance trade-off as in Fig. 1.

Required Data

To evaluate/train MatchFlow, you will need to download the required datasets.

• FlyingThings3D
• Sintel
• KITTI
• HD1K (optional)
• Spring

By default our codes will search for the datasets in these locations. You can create symbolic links to wherever the datasets were downloaded in the datasets folder

├── datasets
    ├── Sintel
        ├── test
        ├── training
    ├── KITTI
        ├── testing
        ├── training
        ├── devkit
    ├── FlyingThings3D
        ├── frames_cleanpass
        ├── frames_finalpass
        ├── optical_flow
    ├── spring
        ├── test
        ├── training
        ├── flow_subsampling

Evaluation

Please download the models to ckpts folder. Then you can evaluate the provided model using following script:

bash evaluate.sh

Training

We used the following training schedule in our paper (2 A100/A6000 GPUs). Training logs will be written to the logs which can be visualized using tensorboard.

bash train.sh

Reference

If you found our paper helpful, please consider citing:

@inproceedings{dong2024memflow,
  title={MemFlow: Optical Flow Estimation and Prediction with Memory},
  author={Dong, Qiaole and Fu, Yanwei},
  booktitle={Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition},
  year={2024}
}

Acknowledgement

Thanks to previous open-sourced repo:

• SKFlow
• VideoFlow