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Automatically Constructing a Corpus of Sentential Paraphrases

Written for the Research library (claude-opus-5-5) from the paper text, in our own words: the license "CC BY-NC-SA 3.0 (ACL Anthology, before 2016)" does not allow redistributing the text itself. Original — aclanthology.org/I05-5002.pdf

Summary

Research on recognizing and generating paraphrases has lacked a large, public, human-labeled set of sentence-level paraphrase pairs. Existing resources are small, cover narrow domains, or rely on multiple translations of uneven quality. Dolan and Brockett describe how they built the Microsoft Research Paraphrase Corpus (MSRP) from web news stories grouped into topic clusters. They first filtered candidate sentence pairs using heuristics on length, shared words and lexical distance, and kept only articles whose author could be identified. They then applied an SVM classifier (SMO) using string-similarity, morphological, WordNet and Encarta thesaurus features. This classifier was deliberately biased toward over-predicting paraphrases. From its output, 5801 pairs were randomly sampled for human labeling, and 67% were judged semantically equivalent. The authors explain why they loosened the equivalence criterion and acknowledge the corpus's biases. They also propose that research groups pool their corpora into a shared "virtual" resource. MSRP later became a standard benchmark for paraphrase identification.

Key points

  • The source data was 13,127,938 sentence pairs from 32,408 news clusters collected over two years. Heuristics, including at least three shared words, 5–40 words per sentence and a length ratio of at least 66.6%, reduced this to 49,375 pairs from author-identified articles.
  • The SVM (SMO, Platt 1999) was trained on 10,000 separately annotated pairs (2968 positive, 7032 negative). It selected 20,574 likely paraphrases, and 5801 of these were sampled for annotation.
  • Two judges labeled each pair as a paraphrase or not, and a third judge settled disagreements. The final count was 3900 positive pairs (67%).
  • The idea of "semantic equivalence" was relaxed to allow pairs that mostly entail each other, with minor differences in content. Pairs that were near-identical at the string level were filtered out.
  • Known limitations include high lexical overlap (mean 0.7), no paraphrases with little word overlap, and a small size. Because of these, the authors see MSRP mainly as an evaluation set rather than training data. Planned extensions include better positive/negative balance, word-aligned data evaluated with AER, and game-based collection from web volunteers.

Our summary of the paper, in our own words — not its text. The work belongs to its authors; read it at the links above.

Fields: Machine translation

Cited by

820 papers of our library cite it (of the 140673 whose bibliographies we read); 46 of them have a page here, 774 not yet.

Cite

The paper itself, not this page. BibTeX from the library's record of the work.

@inproceedings{dolan2005automatically,
  title = {{Automatically Constructing a Corpus of Sentential Paraphrases}},
  author = {Dolan, William B. and Brockett, Chris},
  booktitle = {Proceedings of the Third International Workshop on Paraphrasing (IWP2005)},
  year = {2005},
  url = {https://aclanthology.org/I05-5002/}
}

References

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