Recognizing Implicit Discourse Relations in the Penn Discourse Treebank
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We present an implicit discourse relation classifier in the Penn Discourse Treebank (PDTB). Our classifier considers the con- text of the two arguments, word pair infor- mation, as well as the arguments' internal constituent and dependency parses. Our results on the PDTB yields a significant 14.1% improvement over the baseline. In our error analysis, we discuss four chal- lenges in recognizing implicit relations in the PDTB.