ACL Anthology Network (All About NLP) (beta) The Association Of Computational Linguistics Anthology Network |
ACL ID | W10-3008 |
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Title | Combining Manual Rules and Supervised Learning for Hedge Cue and Scope Detection |
Venue | International Conference on Computational Natural Language Learning |
Session | Main Conference |
Year | 2010 |
Authors |
Hedge cues were detected using a super- vised Conditional Random Field (CRF) classifier exploiting features from the RASP parser. The CRF’s predictions were filtered using known cues and unseen in- stances were removed, increasing preci- sionwhileretainingrecall. Rulesforscope detection, based on the grammatical re- lations of the sentence and the part-of- speech tag of the cue, were manually- developed. However, another supervised CRFclassifierwasusedtorefinethesepre- dictions. As a final step, scopes were con- structed from the classifier output using a small set of post-processing rules. Devel- opmentofthesystemrevealedanumberof issues with the annotation scheme adopted by the organisers.