arXiv Machine Learning By Zhengyan Wan, Yidong Ouyang, Panwen Hu, Qiang Sun

dFlowGRPO: Rate-Aware Policy Optimization for Discrete Flow Models

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The paper introduces dFlowGRPO, a reinforcement learning framework tailored for discrete flow models (DFMs). It generalizes previous work on diffusion large language models by supporting various probability paths and non-masked source distributions, and formulates denoising as a Markov decision process that leverages transition rates and posterior models. Experiments on the multimodal DFM FUDOKI show that dFlowGRPO outperforms existing GRPO methods on text‑to‑image generation and matches continuous flow models on multimodal understanding tasks.

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