A Unified Model for Joint Chinese Word Segmentation and POS Tagging with Heterogeneous Annotation Corpora

Chinese word segmentation and part-of-speech tagging (S&T) are fundamental steps for more advanced Chinese language processing tasks. Recently, it has attracted more and more research interests to exploit heterogeneous annotation corpora for Chinese S&T. In this paper, we propose a unified model for Chinese S&T with heterogeneous annotation corpora. We first automatically construct a loose and uncertain mapping between two representative the heterogeneous corpora, Penn Chinese Tree bank (CTB) and PKU´s People´s Daily (PPD). Then we regard the Chinese S&T with heterogeneous corpora as two ``related´´ tasks and train our unified model on two heterogeneous corpora simultaneously. Experiments show that our unified model can boost the performances of both of the heterogeneous corpora by using the shared information, and achieves significant improvements over the state-of-the-art methods.