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Generative Flow Networks for Discrete Probabilistic Modeling
Dinghuai Zhang · Nikolay Malkin · Zhen Liu · Alexandra Volokhova · Aaron Courville · Yoshua Bengio

Tue Jul 19 02:20 PM -- 02:25 PM (PDT) @ Ballroom 1 & 2

We present energy-based generative flow networks (EB-GFN), a novel probabilistic modeling algorithm for high-dimensional discrete data. Building upon the theory of generative flow networks (GFlowNets), we model the generation process by a stochastic data construction policy and thus amortize expensive MCMC exploration into a fixed number of actions sampled from a GFlowNet. We show how GFlowNets can approximately perform large-block Gibbs sampling to mix between modes. We propose a framework to jointly train a GFlowNet with an energy function, so that the GFlowNet learns to sample from the energy distribution, while the energy learns with an approximate MLE objective with negative samples from the GFlowNet. We demonstrate EB-GFN's effectiveness on various probabilistic modeling tasks. Code is publicly available at https://github.com/zdhNarsil/EB_GFN.

Author Information

Dinghuai Zhang (Mila, Meta)
Nikolay Malkin (Mila / Université de Montréal)
Zhen Liu (Mila, University of Montreal)
Alexandra Volokhova (Moscow Institute of Physics and Technology)
Aaron Courville (Université de Montréal)
Yoshua Bengio (Mila - Quebec AI Institute)

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