2023
DOI: 10.48550/arxiv.2301.06276
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The Role of Baselines in Policy Gradient Optimization

Abstract: We study the effect of baselines in on-policy stochastic policy gradient optimization, and close the gap between the theory and practice of policy optimization methods. Our first contribution is to show that the state value baseline allows on-policy stochastic natural policy gradient (NPG) to converge to a globally optimal policy at an O(1/t) rate, which was not previously known. The analysis relies on two novel findings: the expected progress of the NPG update satisfies a stochastic version of the non-uniform… Show more

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