Papers › Generative Temporal Difference Learning for Infinite-Horizon Prediction

Generative Temporal Difference Learning for Infinite-Horizon Prediction

27 Oct 2020arXiv:2010.14496archive 2025-07-28

Michael Janner, Igor Mordatch, Sergey Levine

We introduce the γ-model, a predictive model of environment dynamics with an infinite probabilistic horizon. Replacing standard single-step models with γ-models leads to generalizations of the procedures central to model-based control, including the model rollout and model-based value estimation. The γ-model, trained with a generative reinterpretation of temporal difference learning, is a natural continuous analogue of the successor representation and a hybrid between model-free and model-based mechanisms. Like a value function, it contains information about the long-term future; like a standard predictive model, it is independent of task reward. We instantiate the γ-model as both a generative adversarial network and normalizing flow, discuss how its training reflects an inescapable tradeoff between training-time and testing-time compounding errors, and empirically investigate its utility for prediction and control.

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