English

Hierarchical Document Encoder for Parallel Corpus Mining

Computation and Language 2019-07-02 v2

Abstract

We explore using multilingual document embeddings for nearest neighbor mining of parallel data. Three document-level representations are investigated: (i) document embeddings generated by simply averaging multilingual sentence embeddings; (ii) a neural bag-of-words (BoW) document encoding model; (iii) a hierarchical multilingual document encoder (HiDE) that builds on our sentence-level model. The results show document embeddings derived from sentence-level averaging are surprisingly effective for clean datasets, but suggest models trained hierarchically at the document-level are more effective on noisy data. Analysis experiments demonstrate our hierarchical models are very robust to variations in the underlying sentence embedding quality. Using document embeddings trained with HiDE achieves state-of-the-art performance on United Nations (UN) parallel document mining, 94.9% P@1 for en-fr and 97.3% P@1 for en-es.

Keywords

Cite

@article{arxiv.1906.08401,
  title  = {Hierarchical Document Encoder for Parallel Corpus Mining},
  author = {Mandy Guo and Yinfei Yang and Keith Stevens and Daniel Cer and Heming Ge and Yun-Hsuan Sung and Brian Strope and Ray Kurzweil},
  journal= {arXiv preprint arXiv:1906.08401},
  year   = {2019}
}

Comments

accepted by WMT2019