No Verifiable Reward for Prosody: Toward Preference-Guided Prosody Learning in TTS

Seungyoun Shin, Dongha Ahn, Jiwoo Kim +1

Recent work reports gains in neural text-to-speech (TTS) with Group Relative Policy Optimization (GRPO). However, in the absence of a verifiable reward for \textit{prosody}, GRPO t…