Masked Language Modeling and the Distributional Hypothesis: Order Word Matters Pre-training for Little
Written for the Research library (claude-opus-5-5) from the paper text. Original — aclanthology.org/2021.emnlp-main.230.pdf
Summary
The paper asks why masked language model (MLM) pre-training works so well. One common view holds that models like BERT learn syntactic abstractions similar to a classical NLP pipeline. The authors test a different explanation: the benefit comes mainly from capturing higher-order word co-occurrence statistics.
To separate the two hypotheses, they pre-train RoBERTa on versions of the BookWiki corpus whose word order has been destroyed. Some variants shuffle words within each sentence while keeping n-grams of varying length intact. Another variant resamples words from the corpus unigram distribution, and a further setup removes positional embeddings entirely. The resulting models are then fine-tuned on ordinary, unshuffled data and examined with both parametric and non-parametric syntactic probes.
The shuffled-order models lose surprisingly little downstream accuracy, even on tasks built to punish order-insensitive models. They also score well on several parametric probes, but non-parametric probes do expose weaker syntax. The authors conclude that distributional information explains much of MLM's success. They argue that current benchmarks and probes need to become harder to genuinely test linguistic knowledge.
Key points
- Pre-training data is the 16GB BookWiki corpus (Toronto Books Corpus plus English Wikipedia). The baseline model trained on natural text is called M_N, and the pre-trained RoBERTa models are publicly released.
- Sentence-level permutation models M_1–M_4 preserve n-grams of size 1–4. No word may keep its original position, and a single permutation is sampled per sentence so the corpus size stays comparable.
- Additional controls include corpus-level bootstrap resampling of words from the unigram distribution and a model trained without positional embeddings, which makes it fully order-agnostic.
- Probing follows Pimentel et al. (2020a), using linear and non-linear probes plus dependency parsing as a complex task. Permuted models sometimes nearly reach M_N on these probes.
- Stimulus-based non-parametric probes in the style of Linzen et al. (2016), Gulordava et al. (2018), and Marvin and Linzen (2018) show that permuted models handle syntax worse. They cannot reliably recover the original word order.
Cited by
- ACES: Translation Accuracy Challenge Sets for Evaluating Machine Translation Metrics
- True Few-Shot Learning with Language Models
Cite
@inproceedings{sinha2021masked,
title = {{Masked Language Modeling and the Distributional Hypothesis: Order Word Matters Pre-training for Little}},
author = {Sinha, Koustuv and Jia, Robin and Hupkes, Dieuwke and Pineau, Joelle and Williams, Adina and Kiela, Douwe},
booktitle = {Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing},
year = {2021},
doi = {10.18653/v1/2021.emnlp-main.230},
url = {https://doi.org/10.18653/v1/2021.emnlp-main.230}
}References
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