On the Encoding of Gender in Transformer-based ASR Representations

• URL: http://arxiv.org/abs/2406.09855v1
• Date: Fri, 14 Jun 2024 09:10:24 GMT
• Title: On the Encoding of Gender in Transformer-based ASR Representations
• Authors: Aravind Krishnan, Badr M. Abdullah, Dietrich Klakow,
• Abstract summary: This work investigates the encoding and utilization of gender in the latent representations of two ASR models, Wav2Vec2 and HuBERT. Our analysis reveals a concentration of gender information within the first and last frames in the final layers, explaining the ease of erasing gender in these layers.
• Score: 18.08250235967961
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: While existing literature relies on performance differences to uncover gender biases in ASR models, a deeper analysis is essential to understand how gender is encoded and utilized during transcript generation. This work investigates the encoding and utilization of gender in the latent representations of two transformer-based ASR models, Wav2Vec2 and HuBERT. Using linear erasure, we demonstrate the feasibility of removing gender information from each layer of an ASR model and show that such an intervention has minimal impacts on the ASR performance. Additionally, our analysis reveals a concentration of gender information within the first and last frames in the final layers, explaining the ease of erasing gender in these layers. Our findings suggest the prospect of creating gender-neutral embeddings that can be integrated into ASR frameworks without compromising their efficacy.

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