Ningyu Zhang, Shumin Deng, Huajun Chen, Dongfang Lou, Zhilin Liao
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We consider the problem of collectively detecting multiple events, particularly in crosssentence settings. The key to dealing with the problem is to encode semantic information and model event inter-dependency at a documentlevel. In this paper, we reformulate it as a Seq2Seq task and propose a Multi-Layer Bidirectional Network (MLBiNet) to capture the document-level association of events and semantic information simultaneously. Specifically, a bidirectional decoder is firstly devised to model event inter-dependency within a sentence when decoding the event tag vector sequence. Secondly, an information aggregation module is employed to aggregate sentencelevel semantic and event tag information. Finally, we stack multiple bidirectional decoders and feed cross-sentence information, forming a multi-layer bidirectional tagging architecture to iteratively propagate information across sentences. We show that our approach provides significant improvement in performance compared to the current state-of-the-art results 1 .
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