TAILIEUCHUNG - Báo cáo khoa học: "Parsing Coordinations"

The present paper is concerned with statistical parsing of constituent structures in German. The paper presents four experiments that aim at improving parsing performance of coordinate structure: 1) reranking the n-best parses of a PCFG parser, 2) enriching the input to a PCFG parser by gold scopes for any conjunct, 3) reranking the parser output for all possible scopes for conjuncts that are permissible with regard to clause structure. Experiment 4 reranks a combination of parses from experiments 1 and 3. . | Parsing Coordinations Sandra Kiibler Indiana University skuebler@ Wolfgang Maier Unversitat Tubingen Erhard Hinrichs Universitat Tubingen eh@ Eva Klett Universitat Tubingen eklett@ Abstract The present paper is concerned with statistical parsing of constituent structures in German. The paper presents four experiments that aim at improving parsing performance of coordinate structure 1 reranking the n-best parses of a PCFG parser 2 enriching the input to a PCFG parser by gold scopes for any conjunct 3 reranking the parser output for all possible scopes for conjuncts that are permissible with regard to clause structure. Experiment 4 reranks a combination of parses from experiments 1 and 3. The experiments presented show that n-best parsing combined with reranking improves results by a large margin. Providing the parser with different scope possibilities and reranking the resulting parses results in an increase in F-score from for the baseline to . While the F-score is similar to the one of the first experiment n-best parsing and reranking the first experiment results in higher recall vs. and the third one in higher precision vs. . Combining the two methods results in the best result with an F-score of . 1 Introduction The present paper is concerned with statistical parsing of constituent structures in German. German is a language with relatively flexible phrasal ordering especially of verbal complements and adjuncts. This makes processing complex cases of coordination particularly challenging and error-prone. The paper presents four experiments that aim at improving parsing performance of coordinate structures the first experiment involves reranking of n-best parses produced by a PCFG parser the second experiment enriches the input to a PCFG parser by offering gold pre-bracketings for any coordinate structures that occur in the sentence. In the third .

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