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arXiv · 2210.05193

Viterbi Decoding of Directed Acyclic Transformer for Non-Autoregressive Machine Translation

Chenze Shao·Zhengrui Ma·Yang Feng
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Abstract

Non-autoregressive models achieve significant decoding speedup in neural machine translation but lack the ability to capture sequential dependency. Directed Acyclic Transformer (DA-Transformer) was recently proposed to model sequential dependency with a directed acyclic graph. Consequently, it has to apply a sequential decision process at inference time, which harms the global translation accuracy. In this paper, we present a Viterbi decoding framework for DA-Transformer, which guarantees to find the joint optimal solution for the translation and decoding path under any length constraint. Experimental results demonstrate that our approach consistently improves the performance of DA-Transformer while maintaining a similar decoding speedup.

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Chenze Shao, Zhengrui Ma, Yang Feng. 2022-10-11. Viterbi Decoding of Directed Acyclic Transformer for Non-Autoregressive Machine Translation. https://arxiv.org/abs/2210.05193

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