Cited by 674Ethics and Social Impacts of AIHate Speech and Cyberbullying DetectionImbalanced Data Classification Techniques

Measuring and Mitigating Unintended Bias in Text Classification

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Dixon, Lucas, Li, John, Sorensen, Jeffrey, Thain, Nithum, Vasserman, Lucy·2018·Proceedings of the 2018 AAAI/ACM Conference on AI, Ethics, and Society

Abstract

We introduce and illustrate a new approach to measuring and mitigating unintended bias in machine learning models. Our definition of unintended bias is parameterized by a test set and a subset of input features. We illustrate how this can be used to evaluate text classifiers using a synthetic test set and a public corpus of comments annotated for toxicity from Wikipedia Talk pages. We also demonstrate how imbalances in training data can lead to unintended bias in the resulting models, and therefore potentially unfair applications. We use a set of common demographic identity terms as the subset of input features on which we measure bias. This technique permits analysis in the common scenario where demographic information on authors and readers is unavailable, so that bias mitigation must focus on the content of the text itself. The mitigation method we introduce is an unsupervised approach based on balancing the training dataset. We demonstrate that this approach reduces the unintended bias without compromising overall model quality.

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  • Real data often has disproportionate amounts of toxicity directed at specific groups.

    “Synthetic data is valuable here because [11] shows that real data often has disproportionate amounts of toxicity directed at specific groups.”

    From Model Cards for Model Reporting (2019) · cites this paper as [11]

    The 'Quantifying bias in dataset' section (page unavailable) reports that certain identity terms appear disproportionately in toxic comments in the authors’ training data; for example, 'gay' appears in 3% of toxic comments but 0.5% of comments overall. It measures comments containing those terms, not whether toxicity is directed at the groups, and does not establish how often this pattern occurs across real datasets generally. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Toxicity classifiers can pick up on biases in the training data and spuriously associate toxicity with the mention of certain demographics.

    “Prior work has shown that toxicity classifiers can pick up on biases in the training data and spuriously associate toxicity with the mention of certain demographics (Park et al., 2018; Dixon et al., 2018).”

    From WILDS: A Benchmark of in-the-Wild Distribution Shifts (2020) · cites this paper as Dixon et al., 2018

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Authors
Dixon, L., Li, J., Sorensen, J., Thain, N., & Vasserman, L.
Affiliations
Google (United States) (US)
Venue
Proceedings of the 2018 AAAI/ACM Conference on AI, Ethics, and Society
Publisher
ACM
Published
2018-12-27
Pages
67-73
ISSN
3065-8365 (ISSN-L)
OpenAlex
W2791170418
Cited by
674
References
11
Citations by year
2026: 43 · 2025: 77 · 2024: 70 · 2023: 103 · 2022: 120 · 2021: 132 · 2020: 76 · 2019: 50 · 2018: 3
FWCI
115.48
Type
conference paper
Language
en
Open access
Locations
Proceedings of the AAAI/ACM Conference on AI Ethics and Society (publishedVersion, cc-by-nc-nd)
Topics
  • Social Sciences › Safety Research › Ethics and Social Impacts of AI
  • Physical Sciences › Computer Science › Artificial Intelligence › Hate Speech and Cyberbullying Detection
  • Physical Sciences › Computer Science › Artificial Intelligence › Imbalanced Data Classification Techniques
Keywords
text classification, bias mitigation, demographic bias, toxicity detection, Wikipedia talk pages, imbalanced training data, algorithmic fairness

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