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data add kmeans clustering scripts Apr 22, 2015
src add support for sparse embedding Feb 7, 2015 initial commit Jan 19, 2015

Embedding Features for Semi-supervised Learning

Author: Jiang Guo,

This tool is used for semi-supervised learning of NER, using various kinds of embedding features. This tool is associated with (Guo et al., 2014). The proposed approaches are shown to be much better than the direct usage of continuous word embedding features.


Data you need:

The original dataset should be converted to BIO-style annotation.

Training an NER tagger

$ ./ [de|bi|ce|proto]

  • de - dense embedding features
  • bi - binarized embedding features
  • ce - clustered features
  • proto - distributional prototype features

To use the combined features, e.g. de+proto


$ ./ [de|bi|ce|proto]


  author    = {Guo, Jiang  and  Che, Wanxiang  and  Wang, Haifeng  and  Liu, Ting},
  title     = {Revisiting Embedding Features for Simple Semi-supervised Learning},
  booktitle = {Proceedings of the 2014 Conference on Empirical Methods in Natural Language Processing (EMNLP)},
  month     = {October},
  year      = {2014},
  address   = {Doha, Qatar},
  publisher = {Association for Computational Linguistics},
  pages     = {110--120},
  url       = {}