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arXiv · 1806.03489

Robust Lexical Features for Improved Neural Network Named-Entity Recognition

Abbas Ghaddar·Philippe Langlais
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Abstract

Neural network approaches to Named-Entity Recognition reduce the need for carefully hand-crafted features. While some features do remain in state-of-the-art systems, lexical features have been mostly discarded, with the exception of gazetteers. In this work, we show that this is unfair: lexical features are actually quite useful. We propose to embed words and entity types into a low-dimensional vector space we train from annotated data produced by distant supervision thanks to Wikipedia. From this, we compute - offline - a feature vector representing each word. When used with a vanilla recurrent neural network model, this representation yields substantial improvements. We establish a new state-of-the-art F1 score of 87.95 on ONTONOTES 5.0, while matching state-of-the-art performance with a F1 score of 91.73 on the over-studied CONLL-2003 dataset.

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Abbas Ghaddar, Philippe Langlais. 2018-06-09. Robust Lexical Features for Improved Neural Network Named-Entity Recognition. https://arxiv.org/abs/1806.03489

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