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PASCAL Challenges Workshop 2

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.

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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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