tailieunhanh - Báo cáo khoa học: "Learning to Temporally Order Medical Events in Clinical Text"

We investigate the problem of ordering medical events in unstructured clinical narratives by learning to rank them based on their time of occurrence. We represent each medical event as a time duration, with a corresponding start and stop, and learn to rank the starts/stops based on their proximity to the admission date. | Learning to Temporally Order Medical Events in Clinical Text Preethi Raghavan Eric Fosler-Lussier and Albert M. Lai Department of Computer Science and Engineering Department of Biomedical Informatics The Ohio State University Columbus Ohio USA raghavap fosler @ Abstract We investigate the problem of ordering medical events in unstructured clinical narratives by learning to rank them based on their time of occurrence. We represent each medical event as a time duration with a corresponding start and stop and learn to rank the starts stops based on their proximity to the admission date. Such a representation allows us to learn all of Allen s temporal relations between medical events. Interestingly we observe that this methodology performs better than a classification-based approach for this domain but worse on the relationships found in the Timebank corpus. This finding has important implications for styles of data representation and resources used for temporal relation learning clinical narratives may have different language attributes corresponding to temporal ordering relative to Timebank implying that the field may need to look at a wider range of domains to fully understand the nature of temporal ordering. 1 Introduction There has been considerable research on learning temporal relations between events in natural language. Most learning problems try to classify event pairs as related by one of Allen s temporal relations Allen 1981 . before simultaneous in-cludes during overlaps begins starts ends finishes and their inverses Mani et al. 2006 . The Timebank corpus widely used for temporal relation learning consists of newswire text annotated for events temporal expressions and temporal relations between events using TimeML Pustejovsky et al. 2003 . In Timebank the notion of an event primarily consists of verbs or phrases that denote change in state. 70 However there may be a need to rethink how we learn temporal relations .

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