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FBGEMM (Facebook GEneral Matrix Multiplication) is a low-precision, high-performance matrix-matrix multiplications and convolution library for server-side inference.

The library provides efficient low-precision general matrix multiplication for small batch sizes and support for accuracy-loss minimizing techniques such as row-wise quantization and outlier-aware quantization. FBGEMM also exploits fusion opportunities in order to overcome the unique challenges of matrix multiplication at lower precision with bandwidth-bound operations.

FBGEMM is used as a backend of PyTorch quantized operators for x86 machines:

See the full Documentation for more information on building, installing, and developing with FBGEMM, as well as the most up-to-date support matrix and API documentation for this library.

What's New?


For a high-level overview, design philosophy and brief descriptions of various parts of FBGEMM please see our blog post.

For those looking for the appropriate article to cite regarding FBGEMM, we recommend citing our paper:

  title={FBGEMM: Enabling High-Performance Low-Precision Deep Learning Inference},
  author={Khudia, Daya and Huang, Jianyu and Basu, Protonu and Deng, Summer and Liu, Haixin and Park, Jongsoo and Smelyanskiy, Mikhail},
  journal={arXiv preprint arXiv:2101.05615},

Join the FBGEMM community

For questions, support, news updates, or feature requests, please feel free to:

For contributions, please see the CONTRIBUTING file for ways to help out.


FBGEMM is BSD licensed, as found in the LICENSE file.