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PASCAL Challenges Workshop 2

Normalized Alignment of Dependency Trees for Detecting Textual Entailment

author: Erwin Marsi, Tilburg University

Description

In this paper, we investigate the usefulness of normalized alignment of dependency trees for entailment prediction. Overall, our approach yields an accuracy of 60% on the RTE2 test set, which is a significant improvement over the baseline. Results vary substantially across the different subsets, with a peak performance on the summarization data. We conclude that normalized alignment is useful for detecting textual entailment, but a robust approach will probably need to include additional sources of information.

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Slides
0:01 Normalized alignment of dependency trees for detecting textual entailment
0:40 Basic idea
1:11 Matching surface words alone is not sufficient...
2:08 Preprocessing
2:27 Syntactic Normalization
2:44 Auxiliary Reduction
3:54 Passive to Active Form
4:09 Copula Reduction
4:20 Alignment of Dependency Trees
5:03 Word Matching
5:20 Alignment example
5:45 Alignment example (cont’d)
6:31 Entailment prediction
6:41 Results
6:54 Problems
7:44 Discussion & Conclusion

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