Binary Neural Networks (BNNs) can drastically reduce memory size and accesses
by applying bit-wise operations instead of standard arithmetic operations.
Therefore it could significantly improve the efficiency and lower the energy
consumption at runtime, which enables the application of state-of-the-art deep
learning models on low power devices. BMXNet is an open-source BNN library
based on MXNet, which supports both XNOR-Networks and Quantized Neural
Networks. The developed BNN layers can be seamlessly applied with other
standard library components and work in both GPU and CPU mode. BMXNet is
maintained and developed by the multimedia research group at Hasso Plattner
Institute and released under Apache license. Extensive experiments validate the
efficiency and effectiveness of our implementation. The BMXNet library, several
sample projects, and a collection of pre-trained binary deep models are
available for download at this https URL

该研究介绍了一个基于 MXNet 的开源 BNN 库 BMXNet，可在 GPU 和 CPU 模式下工作，并支持 XNOR-Networks 和 Quantized Neural Networks，旨在通过二进制运算显著减少内存大小和访问，提高 Deep Learning 模型在低功耗设备上的效率和降低能量消耗，经过广泛的实验验证了其实现的高效性和有效性。

BMXNet: 一种基于 MXNet 的开源二值神经网络实现

BMXNet: An Open-Source Binary Neural Network Implementation Based on  MXNet

We propose two efficient approximations to standard convolutional neural
networks: Binary-Weight-Networks and XNOR-Networks. In Binary-Weight-Networks,
the filters are approximated with binary values resulting in 32x memory saving.
In XNOR-Networks, both the filters and the input to convolutional layers are
binary. XNOR-Networks approximate convolutions using primarily binary
operations. This results in 58x faster convolutional operations and 32x memory
savings. XNOR-Nets offer the possibility of running state-of-the-art networks
on CPUs (rather than GPUs) in real-time. Our binary networks are simple,
accurate, efficient, and work on challenging visual tasks. We evaluate our
approach on the ImageNet classification task. The classification accuracy with
a Binary-Weight-Network version of AlexNet is only 2.9% less than the
full-precision AlexNet (in top-1 measure). We compare our method with recent
network binarization methods, BinaryConnect and BinaryNets, and outperform
these methods by large margins on ImageNet, more than 16% in top-1 accuracy.

本文提出了两种卷积神经网络的高效近似方案：二进制权重网络和 XNOR - 网络，其中 XNOR - 网络既将卷积层输入又将滤波器二值化，主要利用二值运算来近似卷积，这使得卷积速度快 58 倍且内存占用仅为原来的 1/32，而且其分类性能在 ImageNet 数据集上也优于其他网络二值化方法。