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a reimplementation of LiteFlowNet in PyTorch that matches the official Caffe version

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This is a personal reimplementation of LiteFlowNet [1] using PyTorch. Should you be making use of this work, please cite the paper accordingly. Also, make sure to adhere to the licensing terms of the authors. Should you be making use of this particular implementation, please acknowledge it appropriately [2].


For the original Caffe version of this work, please see:
Another optical flow implementation from me:
And another optical flow implementation from me:
Yet another optical flow implementation from me:


The correlation layer is implemented in CUDA using CuPy, which is why CuPy is a required dependency. It can be installed using

pip install cupy
or alternatively using one of the provided binary packages as outlined in the CuPy repository. If you would like to use Docker, you can take a look at this pull request to get started.


To run it on your own pair of images, use the following command. You can choose between three models, please make sure to see their paper / the code for more details.

python --model default --first ./images/first.png --second ./images/second.png --out ./out.flo

I am afraid that I cannot guarantee that this reimplementation is correct. However, it produced results pretty much identical to the implementation of the original authors in the examples that I tried. There are some numerical deviations that stem from differences in the

of Caffe and the
function of PyTorch. Please feel free to contribute to this repository by submitting issues and pull requests.




As stated in the licensing terms of the authors of the paper, their material is provided for research purposes only. Please make sure to further consult their licensing terms.


[1]  @inproceedings{Hui_CVPR_2018,
         author = {Tak-Wai Hui and Xiaoou Tang and Chen Change Loy},
         title = {{LiteFlowNet}: A Lightweight Convolutional Neural Network for Optical Flow Estimation},
         booktitle = {IEEE Conference on Computer Vision and Pattern Recognition},
         year = {2018}
[2]  @misc{pytorch-liteflownet,
         author = {Simon Niklaus},
         title = {A Reimplementation of {LiteFlowNet} Using {PyTorch}},
         year = {2019},
         howpublished = {\url{}}

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