Challenge: Existing non-autoregressive neural machine translation models are slow to learn the dependency between output tokens.
Approach: They propose to use fully non-autoregressive neural machine translation (NAT) to predict tokens with single forward of neural networks.
Outcome: The proposed model achieves state-of-the-art results on three translation benchmarks with comparable performance to autoregressive and iterative NAT systems.

Similar Papers

Non-Autoregressive Neural Machine Translation: A Call for Clarity (2022.emnlp-main)

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Challenge: Non-autoregressive translation models require a single forward pass to generate the output sequence instead of iteratively producing each predicted token.
Approach: They propose to use a single forward pass to generate the output sequence instead of iteratively producing each predicted token.
Outcome: The proposed models improve translation quality and speed under third-party testing environments.
Integrating Translation Memories into Non-Autoregressive Machine Translation (2023.eacl-main)

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Challenge: Non-autoregressive machine translation (NAT) has made great progress, but most studies focus on standard translation tasks.
Approach: They propose to train an edit-based NAT model with a Translation Memory (TM) they propose to modify the data presentation and introduce an extra deletion operation to reduce decoding load.
Outcome: The proposed model performs on par with an autoregressive approach while reducing the decoding load.
Improving Non-Autoregressive Neural Machine Translation via Modeling Localness (2022.coling-1)

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Challenge: Existing non-autoregressive neural machine translation models suffer from poor localization quality due to sequential dependencies within the target sentence.
Approach: They propose to introduce local information into NAT models by explicitly introducing local information about surrounding words into the encoder and decoder sides to achieve localness-aware representations.
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Enriching Non-Autoregressive Transformer with Syntactic and Semantic Structures for Neural Machine Translation (2021.eacl-main)

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Challenge: Existing non-autoregressive models have boosted the efficiency of neural machine translation, but their performance is significantly worse than that of autoregressive counterparts.
Approach: They propose to incorporate syntactic and semantic structures among natural languages into a non-autoregressive Transformer for the task of neural machine translation.
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What Have We Achieved on Non-autoregressive Translation? (2024.findings-acl)

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Challenge: Existing studies have shown that non-autoregressive (NAT) methods underperform autoregressive methods (AT) however, their evaluation using BLEU has been shown to weakly correlate with human annotations.
Approach: They propose to evaluate four representative NAT methods using BLEU to narrow the performance gap between autoregressive and autoregressive translations.
Outcome: The proposed methods underperform NAT and autoregressive methods under more reliable evaluation metrics.
Imitation Learning for Non-Autoregressive Neural Machine Translation (P19-1)

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Challenge: Existing non-autoregressive translation models lack parallel decoding, which is a bottleneck for NMT decoding.
Approach: They propose a framework for non-autoregressive machine translation that emulates the autoregressive model by sampling sentence length in parallel.
Outcome: The proposed model achieves 31.85 BLEU on WMT16 RoEn and 30.68 BLUE on IWSLT16 EnDe on the IWSLD16, WMT14 and WMT15 datasets.
Improving Non-autoregressive Neural Machine Translation with Monolingual Data (2020.acl-main)

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Challenge: Neural machine translation is usually done via knowledge distillation from an autoregressive (AR) model.
Approach: They leverage large monolingual corpora to improve the NAR model's performance by transferring the autoregressive model' s generalization ability while preventing overfitting.
Outcome: The proposed methods on the WMT14 En-De and WMT16 En-Ro news translation tasks show that monolingual data augmentation improves the NAR model to approach the teacher AR model’s performance.
Hybrid-Regressive Paradigm for Accurate and Speed-Robust Neural Machine Translation (2023.findings-acl)

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Challenge: Autoregressive translation (NAT) is less robust in decoding batch size and hardware settings than NAT.
Approach: They propose a two-stage translation prototype that prompts a small number of AT predictions and fills in previously skipped tokens at once.
Outcome: The proposed translation prototype achieves comparable translation quality with AT while having 1.5x faster inference speed regardless of batch size and device.
Con-NAT: Contrastive Non-autoregressive Neural Machine Translation (2022.findings-emnlp)

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Challenge: Neural machine translation models are autoregressive, which means they predict tokens one by one based on source tokens and previously predicted tokens.
Approach: They propose a conditional masked language model which incorporates contrastive learning into the conditional language model.
Outcome: The proposed model improves on WMT’16 Ro-En translation directions with different data sizes.
Assessing Non-autoregressive Alignment in Neural Machine Translation via Word Reordering (2022.findings-emnlp)

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Challenge: Existing non-autoregressive neural machine translation models that implicitly model dependencies are sub-optimal in handling word order errors.
Approach: They propose to learn a non-autoregressive language model that can be combined with Viterbi decoding to achieve better reordering performance.
Outcome: The proposed model outperforms state-of-the-art reordering mechanisms under different word permutation settings with a 2-27 BLEU improvement, suggesting high potential for word alignment in NAT.

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