Cross-Lingual Morphological Tagging for Low-Resource Languages
Cross-Lingual Morphological Tagging for Low-Resource Languages
复制标题
低资源语言的跨语言形态标记
DOI:
10.18653/v1/p16-1184
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
Jan A. Botha
中科院分区:
文献类型:
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作者:
Jan Buys;Jan A. Botha
Morphologically rich languages often lack the annotated linguistic resources required to develop accurate natural language processing tools. We propose models suitable for training morphological taggers with rich tagsets for low-resource languages without using direct supervision. Our approach extends existing approaches of projecting part-of-speech tags across languages, using bitext to infer constraints on the possible tags for a given word type or token. We propose a tagging model using Wsabie, a discriminative embeddingbased model with rank-based learning. In our evaluation on 11 languages, on average this model performs on par with a baseline weakly-supervised HMM, while being more scalable. Multilingual experiments show that the method performs best when projecting between related language pairs. Despite the inherently lossy projection, we show that the morphological tags predicted by our models improve the downstream performance of a parser by +0.6 LAS on average.