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Deep Multitask Learning for Semantic Dependency Parsing

Abstract · Apr 22, 2017 22:56 ·

semantic formalisms graphs arc sdp shared formalism perceptron multitask cs-cl

Arxiv Abstract

  • Hao Peng
  • Sam Thomson
  • Noah A. Smith

We present a deep neural architecture that parses sentences into three semantic dependency graph formalisms. By using efficient, nearly arc-factored inference and a bidirectional-LSTM composed with a multi-layer perceptron, our base system is able to significantly improve the state of the art for semantic dependency parsing, without using hand-engineered features or syntax. We then explore two multitask learning approaches—one that shares parameters across formalisms, and one that uses higher-order structures to predict the graphs jointly. We find that both approaches improve performance across formalisms on average, achieving a new state of the art. Our code is open-source and available at

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