Learning to Distinguish Valid Textual Entailments
author:
Marie-Catherine de Marneffe,
Stanford University
Description
This paper proposes a new architecture for textual inference in which finding a good alignment is separated from evaluating entailment. Current approaches to semantic inference in question answering and textual entailment have approximated the entailment problem as that of computing the best alignment of the hypothesis to the text, using a locally decomposable matching score. While this formulation is adequate for representing local (word-level) phenomena such as synonymy, it is incapable of representing global interactions, such as that between verb negation and the addition/removal of qualifiers, which are often critical for determining entailment.
Categories
Top: Computer Science: Machine Learning: Human Language TechnologyTop: Computer Science: Semantic Web
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| Slides | |
| 0:02 | Robust local textual inference |
| 0:12 | 3 approaches to RTE |
| 0:26 | Graph matching |
| 1:43 | We need sloppy matching! |
| 2:11 | The problem with tree matching |
| 2:49 | Solution: align, then evaluate |
| 3:12 | Things we aimed to fix |
| 4:07 | Whether an alignment is good depends on non-local factors |
| 5:15 | Three-stage architecture |
| 5:37 | Three-step approach (1) |
| 6:52 | Three-step approach (2) |
| 7:38 | Three-step approach (3) |
| 8:36 | Representation/alignment example |
| 10:18 | Structural (mis-)match features |
| 11:06 | Modality features |
| 12:06 | Restrictive adjuncts |
| 12:55 | Factive & implicative features |
| 14:16 | Our RTE2 Results |
| 15:35 | Problems we can fix |
| 16:27 | Problems we can fix |
| 17:32 | More challenging problems |
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