| Summary: | Co-speech gestures are a crucial, non-verbal modality for humans to communicate. Social agents also need this capability to be more human-like and comprehensive. This study aims to model the distribution of gestures conditioned on human speech features. Unlike previous studies that try to find injective functions that map speech to gestures, we propose a novel, conditional GAN-based generative model to not only convert speech into gestures but also to approximate the distribution of gestures conditioned on speech through parameterization. An objective evaluation and user study show that the proposed model outperformed the existing deterministic model, indicating that generative models can approximate real patterns of co-speech gestures better than the existing deterministic model. Our results suggest that it is critical to consider the nature of randomness when modeling co-speech gestures.
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