On a Benefit of Mask Language Modeling: Robustness to Simplicity Bias
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Abstract (arXiv)
Despite the success of pretrained masked language models (MLM), why MLM pretraining is useful is still a qeustion not fully answered. In this work we theoretically and empirically show that MLM pretraining makes models robust to lexicon-level spurious features, partly answer the question. We theoretically show that, when we can model the distribution of a spurious feature Pi conditioned on the context, then (1) Pi is at least as informative as the spurious feature, and (2) learning from Pi is at least as simple as learning from the spurious feature. Therefore, MLM pretraining rescues the model from the simplicity bias caused by the spurious feature. We also explore the efficacy of MLM pretraing in causal settings. Finally we close the gap between our theories and the real world practices by conducting experiments on the hate speech detection and the name entity recognition tasks.
Key facts. Cited by 4 papers in the map (data through 7 Oct 2026). Builds on 34 of its 41 references that are in the map. First posted on arXiv 11 Oct 2021.
Builds on
34 of 41 references.
References · 34
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22 more
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Citing papers per year: 2022: 1; 2023: 1; 2024: 1; 2025: 1.
4 papers.
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- 2025Religious Bias Landscape in Language and Text-to-Image Models: Analysis, Detection, and Debiasing Strategiescited by 8
- 2022Enhancing Tabular Reasoning with Pattern Exploiting Trainingcited by 3
- 2023The Distributional Hypothesis Does Not Fully Explain the Benefits of Masked Language Model Pretrainingcited by 1
- 2025Religious Bias Landscape in Language and Text-to-Image Models: Analysis, Detection, and Debiasing Strategies14 Jan 2025
- 2024Transformers Learn Low Sensitivity Functions: Investigations and Implications11 Mar 2024
- 2023The Distributional Hypothesis Does Not Fully Explain the Benefits of Masked Language Model Pretraining25 Oct 2023
- 2022Enhancing Tabular Reasoning with Pattern Exploiting Training21 Oct 2022