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Hierarchically-Refined Label Attention Network for Sequence Labeling (arxiv.org)
2 points by sel1 on Aug 27, 2019 | hide | past | pdf | discuss on HN

In plain words: Instead of the chain model that only links one tag to the next, this network lets words attend to label meanings and refines tag guesses to catch long-range tag links. It tagged more accurately than the chain model at similar size and ran faster.

Abstract

CRF has been used as a powerful model for statistical sequence labeling. For neural sequence labeling, however, BiLSTM-CRF does not always lead to better results compared with BiLSTM-softmax local classification. This can be because the simple Markov label transition model of CRF does not give much information gain over strong neural encoding. For better representing label sequences, we investigate a hierarchically-refined label attention network, which explicitly leverages label embeddings and captures potential long-term label dependency by giving each word incrementally refined label distributions with hierarchical attention. Results on POS tagging, NER and CCG supertagging show that the proposed model not only improves the overall tagging accuracy with similar number of parameters, but also significantly speeds up the training and testing compared to BiLSTM-CRF.

Leyang Cui, Yue Zhang
arXiv:1908.08676 · cs.CL · submitted Aug 23, 2019 · updated Nov 7, 2019
abstract · pdf · html · EMNLP 2019

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