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arXiv · 1706.03367

A Full Non-Monotonic Transition System for Unrestricted Non-Projective Parsing

Daniel Fernández-González·Carlos Gómez-Rodríguez
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Abstract

Restricted non-monotonicity has been shown beneficial for the projective arc-eager dependency parser in previous research, as posterior decisions can repair mistakes made in previous states due to the lack of information. In this paper, we propose a novel, fully non-monotonic transition system based on the non-projective Covington algorithm. As a non-monotonic system requires exploration of erroneous actions during the training process, we develop several non-monotonic variants of the recently defined dynamic oracle for the Covington parser, based on tight approximations of the loss. Experiments on datasets from the CoNLL-X and CoNLL-XI shared tasks show that a non-monotonic dynamic oracle outperforms the monotonic version in the majority of languages.

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Daniel Fernández-González, Carlos Gómez-Rodríguez. 2017-06-11. A Full Non-Monotonic Transition System for Unrestricted Non-Projective Parsing. https://arxiv.org/abs/1706.03367

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