Forest-Based Semantic Role Labeling

Parsing plays an important role in semantic role labeling (SRL) because most SRL systems infer semantic relations from 1-best parses. Therefore, parsing errors inevitably lead to labeling mistakes. To alleviate this problem, we propose to use packed forest, which compactly encodes all parses for a sentence. We design an algorithm to exploit exponentially many parses to learn semantic relations efficiently. Experimental results on the CoNLL-2005 shared task show that using forests achieves an absolute improvement of 1. 2% in terms of F1 score over using 1-best parses and 0. 6% over using 50-best parses.

Authors

• Hao Xiong
• Haitao Mi Tencent AI Lab, Bellevue, WA
• Yang Liu College of Computer Science, Sichuan University Engineering Research Center of Machine Learning and Industry Intelligence, Ministry of Education
• Qun Liu Huawei Noah's Ark Lab

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