A Level-Synchronous Approach to Ill-formed Sentence Parsing and Error Recovery

In this paper, a level-synchronous parsing mechanism, named Phrase-Level Building (PLB), is proposed to incorporate wide-scope contextual in formation for parsing ill-formed sentences. This mechanism regards the task of parsing a sentence as the task of building the phrase-levels for the sentence. Therefore, the wide-scope contextual information in the phrase-levels can be used to help narrow down the search space and to select the most likely partial parses. Compared with the system which uses both the stochastic context-free grammar and the heuristics rate for brackets in the partial parse forests from 69.37% to 79.49%. The recall rate for brackets is also improved from 78.73% to80.69%.