Abstract:
This paper addresses a policy optimization task with the conditional value-at-risk (CVaR) objective. We introduce the predictive CVaR policy gradient, a novel approach that seamlessly integrates risk-neutral policy gradient algorithms with minimal modifications. Our method incorporates a reweighting strategy in gradient calculation -- individual cost terms are reweighted in proportion to their predicted contribution to the objective. These weights can be easily estimated through a separate learning procedure. We provide theoretical and empirical analyses, demonstrating the validity and effectiveness of our proposed method.
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