Long Short-Term Memory (LSTM) is a popular approach to boosting the ability of Recurrent Neural Networks to store longer term temporal information. The capacity of an LSTM network can be increased by widening and adding layers. However, usually the former introduces additional parameters, while the latter increases the runtime. As an alternative we propose the Tensorized LSTM in which the hidden states are represented by tensors and updated via a cross-layer convolution. By increasing the tensor size, the network can be widened efficiently without additional parameters since the parameters are shared across different locations in the tensor; by delaying the output, the network can be deepened implicitly with little additional runtime since deep computations for each timestep are merged into temporal computations of the sequence. Experiments conducted on five challenging sequence learning tasks show the potential of the proposed model.

本文介绍了一种新的神经网络模型，即Tensorized LSTM，它使用张量来表示隐藏状态，通过跨层卷积来更新这些状态。该模型在不增加额外参数的情况下，有效地扩展了网络的容量，并将深度计算合并为时序计算，从而提高了其性能。实验结果表明，该模型在多项挑战性的序列学习任务中表现出很大的潜力。

更广更深，更便宜更快：张量LSTM用于序列学习