Arc-Hybrid Non-Projective Dependency Parsing with a Static-Dynamic Oracle

WS 2017  ·  Miryam de Lhoneux, Sara Stymne, Joakim Nivre ·

In this paper, we extend the arc-hybrid system for transition-based parsing with a swap transition that enables reordering of the words and construction of non-projective trees. Although this extension breaks the arc-decomposability of the transition system, we show how the existing dynamic oracle for this system can be modified and combined with a static oracle only for the swap transition. Experiments on 5 languages show that the new system gives competitive accuracy and is significantly better than a system trained with a purely static oracle.

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