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How Furiously Can Colorless Green Ideas Sleep? Sentence Acceptability in Context

Paper · 2020 · Jey Han Lau, Carlos Armendariz, Shalom Lappin et al.

Summary

The paper examines how surrounding text shapes human judgments of sentence naturalness, and whether unsupervised language models can predict those judgments. The authors took 50 English Wikipedia sentences and created degraded variants with round-trip machine translation using Moses. They then collected crowdsourced ratings on Amazon Mechanical Turk under three conditions: the sentence alone, the sentence after its real three-sentence preceding context, and the sentence after an unrelated passage from another article. A topic-identification step ensured that workers actually read the context.

Context of either kind compressed the ratings: weak sentences scored higher and strong ones lower. The authors attribute this to cognitive load. Real context also raised scores across the board compared with random context, which points to a separate discourse coherence effect.

In the modeling experiments, bidirectional transformers such as BERT clearly beat left-to-right recurrent models. The strongest model reached roughly human-level agreement, setting a new state of the art for unsupervised acceptability prediction. This questions whether left-to-right processing is the right bias for these models.

Key points

  • Test set: 250 sentences, made up of 50 originals plus round-trip translations through Czech, Spanish, German and French. The contexts were left untranslated.
  • Annotation design:
    • 25 HITs of 10 sentences each, with 20 annotators per HIT.
    • A 4-point naturalness scale, from bad (1) to good (4).
    • Disjoint worker groups for each of the three conditions (H∅, H+, H−).
    • Filtering removed 504 ratings, about 3.9% of the total.
  • Correlations between conditions (Pearson's r): ratings with real context (H+) correlated at 0.940 with no-context ratings (H∅), and ratings with random context (H−) correlated at 0.911 with H∅. The two context conditions, H− and H+, correlated at 0.891 with each other.
  • Compression effect: when context was added, highly rated sentences dropped by about 0.08 on average, while poorly rated ones rose by about 0.45.
  • Coherence effect: real context gave consistently higher ratings than random context (one-tailed Wilcoxon signed-rank test, p = 1.9 × 10⁻⁸). Bidirectional models outperformed unidirectional ones (e.g., TDLM) by a wide margin.

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

 Institutions

 Fields, topics and concepts

Cite

Cite as Jey Han Lau, Carlos Armendariz, Shalom Lappin, Matthew Purver and Chang Shu. 2020. How Furiously Can Colorless Green Ideas Sleep? Sentence Acceptability in Context. 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_00315

@article{lau2020how,
  title = {{How Furiously Can Colorless Green Ideas Sleep? Sentence Acceptability in Context}},
  author = {Jey Han Lau, Carlos Armendariz, Shalom Lappin, Matthew Purver and Chang Shu},
  journal = {Transactions of the Association for Computational Linguistics},
  year = {2020},
  doi = {10.1162/tacl\_a\_00315},
  url = {https://doi.org/10.1162/tacl_a_00315}
}

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