Jessica Grieser


2023

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Evaluation of African American Language Bias in Natural Language Generation
Nicholas Deas | Jessica Grieser | Shana Kleiner | Desmond Patton | Elsbeth Turcan | Kathleen McKeown
Proceedings of the 2023 Conference on Empirical Methods in Natural Language Processing

While biases disadvantaging African American Language (AAL) have been uncovered in models for tasks such as speech recognition and toxicity detection, there has been little investigation of these biases for language generation models like ChatGPT. We evaluate how well LLMs understand AAL in comparison to White Mainstream English (WME), the encouraged “standard” form of English taught in American classrooms. We measure large language model performance on two tasks: a counterpart generation task, where a model generates AAL given WME and vice versa, and a masked span prediction (MSP) task, where models predict a phrase hidden from their input. Using a novel dataset of AAL texts from a variety of regions and contexts, we present evidence of dialectal bias for six pre-trained LLMs through performance gaps on these tasks.