ISSN 1000-1239 CN 11-1777/TP

Journal of Computer Research and Development

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Document-Level Event Temporal Relation Extraction with Context Information

Wang Jun1,2 , Shi Cunhui1,2 , Zhang Jin1 , Yu Xiaoming1 , Liu Yue1 , Cheng Xueqi1   

  1. 1Key Laboratory of Network Data Science and TechnologyInstitute of Computing Technology, Chinese Academy of Sciences), Chinese Academy of Sciences, Beijing 100190);

    2University of Chinese Academy of Sciences, Beijing 100049

  • Supported by: 
    This work was supported by the General Program of the National Natural Science Foundation of China (91746301, 61772501) and the National Key Research and Development Program of China (29198220, 2017YFC0820404).

Abstract: Event temporal relation extraction is an important natural language understanding task, which can be widely used in downstream tasks such as construction of knowledge graph, question answering system and narrative generation. Existing event temporal relation extraction methods often treat the task as a sentence-level event pair classification problem, and solve it by some classification model. However, based on limited local sentence information, the accuracy of the extraction of temporal relations among events is low and the global consistency of the temporal relations cannot be guaranteed. For this problem, this paper proposes a document-level temporal relation extraction method with context information of events. This method uses the neural network model based on Bi-LSTM (bidirectional long short-term memory) to learn the temporal relation expressions of event pairs, and then uses the self-attention mechanism to combine the information of other event pairs in the context, to obtain a better event temporal relation expression for temporal relation classification. At last, that event temporal relation expression with context information will improve the global event temporal relation extraction by enhancing temporal relation classification of all event pairs in the document. Experiments on the TB-Dense (timebank dense) dataset and the MATRES (multi-axis temporal relations for start-points) dataset show that this method can achieve better results than the latest sentence-level methods.

Key words: event temporal relation extraction, temporal relation classification, event relation identification, self-attention, Bi-LSTM