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

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.Comment: 11 pages. Accepted for publication at ACL 201

Madrid, ciudad clandestina

Al finalizar la Guerra Civil, el Partido Comunista de España tuvo que hacer frente a una nueva organización en el exilio, pero asimismo permanecieron antiguos militantes y simpatizantes dentro de la península. Éstos últimos fueron quienes protagonizaron los primeros intentos de resistencia y oposición en el interior del país contra el nuevo régimen. Las dificultades no fueron empero pocas, procedentes tanto de la presión policial como de la descoordinación y rivalidades internas

The Sociology of Elite Distinction. From Theoretical to Comparative Perspectives. Jean-Pascal Daloz

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