Automatic Machine Translation Evaluation in Many Languages via Zero-Shot Paraphrasing

• URL: http://arxiv.org/abs/2004.14564v2
• Date: Tue, 27 Oct 2020 23:54:02 GMT
• Title: Automatic Machine Translation Evaluation in Many Languages via Zero-Shot Paraphrasing
• Authors: Brian Thompson and Matt Post
• Abstract summary: We frame the task of machine translation evaluation as one of scoring machine translation output with a sequence-to-sequence paraphraser. We propose training the paraphraser as a multilingual NMT system, treating paraphrasing as a zero-shot translation task. Our method is simple and intuitive, and does not require human judgements for training.
• Score: 11.564158965143418
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We frame the task of machine translation evaluation as one of scoring machine translation output with a sequence-to-sequence paraphraser, conditioned on a human reference. We propose training the paraphraser as a multilingual NMT system, treating paraphrasing as a zero-shot translation task (e.g., Czech to Czech). This results in the paraphraser's output mode being centered around a copy of the input sequence, which represents the best case scenario where the MT system output matches a human reference. Our method is simple and intuitive, and does not require human judgements for training. Our single model (trained in 39 languages) outperforms or statistically ties with all prior metrics on the WMT 2019 segment-level shared metrics task in all languages (excluding Gujarati where the model had no training data). We also explore using our model for the task of quality estimation as a metric--conditioning on the source instead of the reference--and find that it significantly outperforms every submission to the WMT 2019 shared task on quality estimation in every language pair.

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