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TR-BERT: Dynamic Token Reduction for Accelerating BERT Inference

2021-05-25 02:28:51
Deming Ye, Yankai Lin, Yufei Huang, Maosong Sun

Abstract

Existing pre-trained language models (PLMs) are often computationally expensive in inference, making them impractical in various resource-limited real-world applications. To address this issue, we propose a dynamic token reduction approach to accelerate PLMs' inference, named TR-BERT, which could flexibly adapt the layer number of each token in inference to avoid redundant calculation. Specially, TR-BERT formulates the token reduction process as a multi-step token selection problem and automatically learns the selection strategy via reinforcement learning. The experimental results on several downstream NLP tasks show that TR-BERT is able to speed up BERT by 2-5 times to satisfy various performance demands. Moreover, TR-BERT can also achieve better performance with less computation in a suite of long-text tasks since its token-level layer number adaption greatly accelerates the self-attention operation in PLMs. The source code and experiment details of this paper can be obtained from this https URL.

Abstract (translated)

URL

https://arxiv.org/abs/2105.11618

PDF

https://arxiv.org/pdf/2105.11618.pdf


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