Word embeddings learnt from massive text collections have demonstrated significant levels of discriminative biases such as gender, racial or ethnic biases, which in turn bias the down-stream NLP applications that use those word embeddings. Taking gender-bias as a working example, we propose a debiasing method that preserves non-discriminative gender-related information, while removing stereotypical discriminative gender biases from pre-trained word embeddings. Specifically, we consider four types of information: \emph{feminine}, \emph{masculine}, \emph{gender-neutral} and \emph{stereotypical}, which represent the relationship between gender vs. bias, and propose a debiasing method that (a) preserves the gender-related information in feminine and masculine words, (b) preserves the neutrality in gender-neutral words, and (c) removes the biases from stereotypical words. Experimental results on several previously proposed benchmark datasets show that our proposed method can debias pre-trained word embeddings better than existing SoTA methods proposed for debiasing word embeddings while preserving gender-related but non-discriminative information.

该研究提出了一种针对word embeddings中性别偏见问题的去偏方法，通过保留与性别相关、非歧视性别信息的同时，去除预先训练好的word embeddings中的刻板性别歧视偏差，实验结果表明该方法在保留性别相关但非歧视性别信息的同时，能够更好地去偏，适用于一系列benchmark数据集和NLP应用。

预训练词嵌入的性别保持去偏置