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Deriving Boolean structures from distributional vectors

Paper · 2015 · German Kruszewski, Denis Paperno and Marco Baroni

Summary

Distributional semantic models scale to huge vocabularies and capture how related words are, but they handle logical relations such as entailment poorly. Formal, model-theoretic semantics treats those relations elegantly but cannot be learned from data at scale. Kruszewski, Paperno and Baroni combine the two by learning a mapping from distributional vectors into Boolean-like vectors, in which entailment becomes feature inclusion: the active bits of the more specific expression must be contained in those of the more general one. The inputs are word vectors and sentence vectors composed with the method of Paperno et al. (2014). The resulting Boolean Distributional Semantic Model (BDSM) is trained on entailing and non-entailing pairs. Only the mapping weights are learned, while the inclusion-based inference step is fixed in advance. On lexical and sentential entailment, BDSM matches a strong SVM baseline, beats it on sentences, and degrades less when training data shrink. The induced vectors are compact and partly interpretable. They shift the space away from plain relatedness toward overlap of denotations, a promising route to logic-aware distributional semantics.

Key points

  • Model: a sigmoid with a "temperature" parameter is applied to a linear transform (W, b), relaxed to the interval [0, 1]^H, and trained with MSE on entailment predictions. The main baseline, an SVM trained directly on distributional vectors, builds on earlier work by Weeds et al. (2014), Roller et al. (2014) and Baroni et al. (2012).
  • Interpretability and efficiency: each word gets one compact Boolean vector that alone suffices to check its entailments, which can reduce memory and compute needs. The number of active dimensions correlates with how general or abstract a word is.
  • Qualitative test set: 624 related word pairs, built from the 10 nearest neighbours of the 10K most frequent words and filtered to the 60K–90K frequency range of a 2.8B-token corpus. Cosines in the two spaces were z-normalized before comparison.
  • Findings on that set: co-hyponyms (137 pairs) and personal names (97 pairs) become less similar after mapping (p < 0.001). Synonyms (49) and derivationally related words (10) become more similar (p < 0.01). The extensional reading holds only as a tendency; for example, man and woman still overlap considerably.
  • Publication: TACL vol. 3 (2015), pp. 375–388, released under CC-BY-NC-SA 4.0 and supported by the ERC COMPOSES grant. Planned future work covers negation, conjunction and enforcing disjointness between co-hyponyms.

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

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Cite

Cite as German Kruszewski, Denis Paperno and Marco Baroni. 2015. Deriving Boolean structures from distributional vectors. Transactions of the Association for Computational Linguistics.

The paper itself, not this page. BibTeX from the library's record of the work. DOI 10.1162/tacl_a_00145

@article{kruszewski2015deriving,
  title = {{Deriving Boolean structures from distributional vectors}},
  author = {German Kruszewski, Denis Paperno and Marco Baroni},
  journal = {Transactions of the Association for Computational Linguistics},
  year = {2015},
  doi = {10.1162/tacl\_a\_00145},
  url = {https://doi.org/10.1162/tacl_a_00145}
}

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