Deformable Butterfly: A Highly Structured and Sparse Linear TransformDownload PDF

21 May 2021, 20:41 (modified: 26 Oct 2021, 05:08)NeurIPS 2021 PosterReaders: Everyone
Keywords: Deformable Butterfly, Linear transform, Model compression
TL;DR: A new kind of linear transform named deformable butterfly (DeBut) that generalizes the conventional butterfly matrices and can be adopted to various input-output dimensions.
Abstract: We introduce a new kind of linear transform named Deformable Butterfly (DeBut) that generalizes the conventional butterfly matrices and can be adapted to various input-output dimensions. It inherits the fine-to-coarse-grained learnable hierarchy of traditional butterflies and when deployed to neural networks, the prominent structures and sparsity in a DeBut layer constitutes a new way for network compression. We apply DeBut as a drop-in replacement of standard fully connected and convolutional layers, and demonstrate its superiority in homogenizing a neural network and rendering it favorable properties such as light weight and low inference complexity, without compromising accuracy. The natural complexity-accuracy tradeoff arising from the myriad deformations of a DeBut layer also opens up new rooms for analytical and practical research. The codes and Appendix are publicly available at:
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