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Fast Binarized Neural Network Training with Partial Pre-training

Binarized neural networks, networks with weights and activations constrained to lie in a 2-element set, allow for more time- and resource-efficient inference than standard floating-point networks. However, binarized neural networks typically take more training to plateau in accuracy than their floating-point counterparts, in terms of both iteration count and wall clock time. We demonstrate a technique, partial pre-training, that allows for faster from-scratch training of binarized neural networks by first training the network as a standard floating-point network for a short amount of time, then converting the network to a binarized neural network and continuing to train from there. Without tuning any hyperparameters across four networks on three different datasets, partial pre-training is able to train binarized neural networks between $1.26\times$ and $1.61\times$ faster than when training a binarized network from scratch using standard low-precision training.

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