This repository is the official PyTorch implementation of training & evaluation code for ExpandNets: Linear Over-parameterization to Train Compact Convolutional Networks, NeurIPS 2020.

Code is in early release and may be subject to change. Please feel free to open an issue in case of questions.

Figure 1: ExpandNets. We propose 3 strategies to linearly expand a compact network. An expanded network can then be contracted back to the compact one algebraically, and outperforms training the compact one, even with knowledge distillation.

Here are code for image classification experiments on CIFAR-10, CIFAR-100 and ImageNet.

Details on each experiment are listed in corresponding README.md in each folder.

We provide some toy code to expand a convolutional layer with either standard or depthwise convolutions and contract the expanded layers back.

Code in dummy_test.py is same as it in our supplementary material, which can be run simply.

python dummy_test.py

@inproceedings{NEURIPS2020_expandnets,
               author = {Guo, Shuxuan and Alvarez, Jose M. and Salzmann, Mathieu},
               booktitle = {Advances in Neural Information Processing Systems},
               editor = {H. Larochelle and M. Ranzato and R. Hadsell and M. F. Balcan and H. Lin},
               pages = {1298--1310},
               publisher = {Curran Associates, Inc.},
               title = {ExpandNets: Linear Over-parameterization to Train Compact Convolutional Networks},
               url = {https://proceedings.neurips.cc/paper/2020/file/0e1ebad68af7f0ae4830b7ac92bc3c6f-Paper.pdf},
               volume = {33},
               year = {2020}
}