NLP

ML Applications

Parallel Machine Translation with Disentangled Context Transformer

July 15, 2020

Abstract

State-of-the-art neural machine translation models generate a translation from left to right and every step is conditioned on the previously generated tokens. The sequential nature of this generation process causes fundamental latency in inference since we cannot generate multiple tokens in each sentence in parallel. We propose an attention-masking based model, called Disentangled Context (DisCo) transformer, that simultaneously generates all tokens given different contexts. The DisCo transformer is trained to predict every output token given an arbitrary subset of the other reference tokens. We also develop the parallel easy-first inference algorithm, which iteratively refines every token in parallel and reduces the number of required iterations. Our extensive experiments on 7 translation directions with varying data sizes demonstrate that our model achieves competitive, if not better, performance compared to the state of the art in nonautoregressive machine translation while significantly reducing decoding time on average. Our code is avaiable at https://github.com/facebookresearch/DisCo.

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AUTHORS

Written by

Jungo Kasai

James Cross

Marjan Ghazvininejad

Jiatao Gu

Publisher

International Conference on Machine Learning (ICML)

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