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arXiv · 2202.13590

LCP-dropout: Compression-based Multiple Subword Segmentation for Neural Machine Translation

Keita Nonaka·Kazutaka Yamanouchi·Tomohiro I·Tsuyoshi Okita·Kazutaka Shimada·Hiroshi Sakamoto
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Abstract

In this study, we propose a simple and effective preprocessing method for subword segmentation based on a data compression algorithm. Compression-based subword segmentation has recently attracted significant attention as a preprocessing method for training data in Neural Machine Translation. Among them, BPE/BPE-dropout is one of the fastest and most effective method compared to conventional approaches. However, compression-based approach has a drawback in that generating multiple segmentations is difficult due to the determinism. To overcome this difficulty, we focus on a probabilistic string algorithm, called locally-consistent parsing (LCP), that has been applied to achieve optimum compression. Employing the probabilistic mechanism of LCP, we propose LCP-dropout for multiple subword segmentation that improves BPE/BPE-dropout, and show that it outperforms various baselines in learning from especially small training data.

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Keita Nonaka, Kazutaka Yamanouchi, Tomohiro I, Tsuyoshi Okita, Kazutaka Shimada, Hiroshi Sakamoto. 2022-02-28. LCP-dropout: Compression-based Multiple Subword Segmentation for Neural Machine Translation. https://doi.org/10.3390/electronics11071014

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