Proximal Policy Optimization for Amortized Discrete Sampling
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Computer Science > Machine Learning
Title:Proximal Policy Optimization for Amortized Discrete Sampling
Abstract:This paper explores policy gradient algorithms for training stochastic policies to sample from structured discrete probability distributions under the Generative Flow Network (GFlowNet) framework. Building on extensive theoretical connections between GFlowNets and entropy-regularized reinforcement learning, we derive equivalents of standard policy gradient algorithms for training GFlowNets, as well as experimentally explore their various methodological aspects, including baseline training and advantage estimation. Most importantly, our work is the first to derive and successfully apply proximal policy optimization to GFlowNets, showing its improved convergence speed and data efficiency compared to standard GFlowNet training objectives on benchmarks ranging from synthetic energies to molecular graph generation.
| Subjects: | Machine Learning (cs.LG); Artificial Intelligence (cs.AI); Machine Learning (stat.ML) |
| Cite as: | arXiv:2606.15793 [cs.LG] |
| (or arXiv:2606.15793v1 [cs.LG] for this version) | |
| https://doi.org/10.48550/arXiv.2606.15793
arXiv-issued DOI via DataCite (pending registration)
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