Delexicalized transfer parsing for low-resource languages using transformed and combined treebanks

摘要

This paper describes the ITT Kharagpur dependency parsing system in CoNLL-2017 shared task on Multilingual Parsing from Raw Text to Universal Dependencies. We primarily focus on the low-resource languages (surprise languages). We have developed a framework to combine multiple treebanks to train parsers for low resource languages by a delexicalization method. We have applied transformation on the source language treebanks based on syntactic features of the low-resource language to improve performance of the parser. In the official evaluation, our system achieves macro-averaged LAS scores of 67.61 and 37.16 on the entire blind test data and the surprise language test data respectively.