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Home / Graduate / M.S. Theses Completed
  Önder Eker, 2009  [download thesis]    

Thesis Title

Parser Evaluation Using Textual Entailments


Syntactic parsing is a basic problem in natural language processing. It can be
defined as assigning a structure to a sentence. Two prevalent approaches to parsing
are phrase-structure parsing and dependency parsing. A related problem is parser
evaluation. This thesis proposes Parser Evaluation using Textual Entailments as a
dependency-based evaluation where a parse is represented as a list of simple sentences,
similar to the Recognizing Textual Entailments task. Each entailment focuses on one re-
lation. A priori training of annotators is not required. A program generates entailments
from a dependency parse. Phrase-structure parses are converted to dependency parses
to generate entailments. Additional entailments are generated for phrase-structure co-
ordinations. Experiments are carried out with a function-tagger. Parsers are evaluated
on the set of entailments generated from the Penn Treebank WSJ and Brown test
sections. A phrase-structure parser obtained the highest score.

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