The Hebrew treebank (HTB), consisting of 6221 morpho-syntactically annotated newspaper sentences, has been the only resource for training and validating statistical parsers and taggers for Hebrew, for almost two decades now. During these decades, the HTB has gone through a trajectory of automatic and semi-automatic conversions, until arriving at its UDv2 form. In this work we manually validate the UDv2 version of the HTB, and, according to our findings, we apply scheme changes that bring the UD HTB to the same theoretical grounds as the rest of UD. Our experimental parsing results with UDv2New confirm that improving the coherence and internal consistency of the UD HTB indeed leads to improved parsing performance. At the same time, our analysis demonstrates that there is more to be done at the point of intersection of UD with other linguistic processing layers, in particular, at the points where UD interfaces external morphological and lexical resources.
|Title of host publication||EMNLP 2018 - 2nd Workshop on Universal Dependencies, UDW 2018 - Proceedings of the Workshop|
|Publisher||Association for Computational Linguistics (ACL)|
|Number of pages||11|
|State||Published - 2018|
|Event||2nd Workshop on Universal Dependencies, UDW 2018, held in conjunction with EMNLP 2018 - Brussels, Belgium|
Duration: 1 Nov 2018 → …
|Name||EMNLP 2018 - 2nd Workshop on Universal Dependencies, UDW 2018 - Proceedings of the Workshop|
|Conference||2nd Workshop on Universal Dependencies, UDW 2018, held in conjunction with EMNLP 2018|
|Period||1/11/18 → …|
Bibliographical noteFunding Information:
We thank the ONLP team at the Open University of Israel for fruitful discussions throughout the process. We further thank two anonymous reviewers for their detailed and insightful comments. This research is supported by the European Research Council, ERC-StG-2015 scheme, Grant number 677352, and by the Israel Science Foundation (ISF), Grant number 1739/26, for which we are grateful.
© 2018 Association for Computational Linguistics