# Hierarchical Classification and Transfer Learning to Recognize Head Gestures and Facial Expressions Using Earbuds

> Research article (Proceedings of the 2021 International Conference on Multimodal Interaction, 2021) · cited 20× · AI/ML

**Wikidata**: [openalex:W3207180004](https://www.wikidata.org/wiki/openalex:W3207180004)  
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