Combining Global Models for Parsing Universal Dependencies
Tianze Shi, Felix Wu, Xilun Chen, Yao Cheng · 2017
We describe our entry, C2L2, to the CoNLL 2017 shared task on parsing Universal Dependencies from raw text.Our system features an ensemble of three global parsing paradigms, one graph-based and two transition-based.Each model leverages character-level bidirectional LSTMs as lexical feature extractors to encode morphological information.Though relying on baseline tokenizers and focusing only on parsing, our system ranked second in the official end-toend evaluation with a macro-average of 75.00 LAS F1 score over 81 test treebanks.In addition, we had the top average performance on the four surprise languages and on the small treebank subset.