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Learning from Annotation Uncertainty: Entropy-Aware Curriculum for Speech Emotion Recognition

2026-06-25 20:35:17
Zahra Omidi, John H. L. Hansen
arXiv_SD
       
Abstract

Speech emotion recognition (SER) often relies on hard consensus labels that collapse annotator disagreement. We study distribution-based supervision for 9-class SER on MSP-Podcast 2.0 using a WavLM-Base multitask model for categorical emotion and dimensional VAD. Hard-label training is compared with targets from primary and merged primary--secondary annotator vote distributions. Distributional objectives improve alignment with human vote distributions, reducing JSD/KLD relative to hard-label training. Analysis shows that hard supervision partly benefits from assigning ambiguous utterances to the residual Other class, whereas distributional supervision redistributes uncertainty across emotion categories. Entropy-stratified evaluation shows that high-ambiguity utterances remain challenging, but distribution-based supervision better captures perceptual uncertainty. These findings support moving beyond hard labels toward targets that reflect listener disagreement.

Abstract (translated)

URL

https://arxiv.org/abs/2606.27536

PDF

https://arxiv.org/pdf/2606.27536.pdf

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