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ntson2002 / lstm-crf-tagging

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Nested named entity recognition using multilayer recurrent neural networks

This model is reported in the paper: Nguyen Truong Son, Nguyen Le Minh, "Nested named entity recognition using multilayer recurrent neural networks", PACLING 2017, August 16 - 18, 2017, Sedona Hotel, Yangon, Myanmar (to be appear)

Requirements:

  • Python 2.7, with Numpy and Theano installed.

Two implemented models:

  • lstm-tagger-v4: Implementation of single BI-LSTM-CRF with additional features to recognize named entites at the top level.

  • multi-lstm: Implementation of Multilayer BI-LSTM-CRF model to recognize nested named entities.

Our proposed models are based on Lample et al 2016.

Evaluation results on the official test set VLSP 2016

Model POS CHUNK Pre-trained F1 %
1 82.9 baseline1 (Lample et. al)
2 X 86.44 +3.54%
3 X 89.77 +6.87%
4 X X 90.27 +7.37%
5 X 86.84 baseline2 (Lample et. al)
6 X X 88.66 +1.82%
7 X X 91.79 +4.95%
8 X X X 92.97 +6.13%
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