arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2501.04662cs.CL

论语言模型中文化偏见的起源:从预训练数据到语言现象

On The Origin of Cultural Biases in Language Models: From Pre-training Data to Linguistic Phenomena

Georgia Institute of Technology(佐治亚理工学院)

Tarek Naous, Wei Xu

AI总结:

本文构建阿拉伯语—英语平行基准 CAMeL-2,揭示语言模型的文化偏见源于预训练实体频率、多义性、词汇重叠及频率分词机制。

摘要:

已有研究表明,语言模型(LMs)在以非西方语言运行时,会对与西方文化相关的实体表现出强烈偏好。本文旨在通过分析若干影响因素来揭示语言模型中与实体相关的文化偏见的起源,这些因素包括实体在预训练数据中的表征,以及跨语言的语言现象变化所带来的影响。我们提出了 CAMeL-2,这是一个阿拉伯语—英语平行基准,包含与阿拉伯文化和西方文化相关的 58,086 个实体,以及 367 个针对实体的掩码自然语境。我们使用 CAMeL-2 进行的评估表明,与使用阿拉伯语测试相比,语言模型在使用英语测试时,不同文化之间的性能差距有所缩小。我们发现,语言模型在处理阿拉伯语中的高频预训练实体时存在困难,因为这些实体可能具有多种词义。这一问题还延伸到与那些并非阿拉伯语、但使用阿拉伯字母的语言具有高度词汇重叠的实体。此外,我们还说明了基于频率的分词如何导致语言模型出现这一问题,而且阿拉伯语词汇表越大,问题会越严重。我们将在 https://github.com/tareknaous/camel2 提供 CAMeL-2。

英文摘要:

Language Models (LMs) have been shown to exhibit a strong preference towards entities associated with Western culture when operating in non-Western languages. In this paper, we aim to uncover the origins of entity-related cultural biases in LMs by analyzing several contributing factors, including the representation of entities in pre-training data and the impact of variations in linguistic phenomena across languages. We introduce CAMeL-2, a parallel Arabic-English benchmark of 58,086 entities associated with Arab and Western cultures and 367 masked natural contexts for entities. Our evaluations using CAMeL-2 reveal reduced performance gaps between cultures by LMs when tested in English compared to Arabic. We find that LMs struggle in Arabic with entities that appear at high frequencies in pre-training, where entities can hold multiple word senses. This also extends to entities that exhibit high lexical overlap with languages that are not Arabic but use the Arabic script. Further, we show how frequency-based tokenization leads to this issue in LMs, which gets worse with larger Arabic vocabularies. We will make CAMeL-2 available at: https://github.com/tareknaous/camel2

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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