Risk-Sensitive and Robust Decision-Making: a CVaR Optimization Approach
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Abstract (arXiv)
In this paper we address the problem of decision making within a Markov decision process (MDP) framework where risk and modeling errors are taken into account. Our approach is to minimize a risk-sensitive conditional-value-at-risk (CVaR) objective, as opposed to a standard risk-neutral expectation. We refer to such problem as CVaR MDP. Our first contribution is to show that a CVaR objective, besides capturing risk sensitivity, has an alternative interpretation as expected cost under worst-case modeling errors, for a given error budget. This result, which is of independent interest, motivates CVaR MDPs as a unifying framework for risk-sensitive and robust decision making. Our second contribution is to present an approximate value-iteration algorithm for CVaR MDPs and analyze its convergence rate. To our knowledge, this is the first solution algorithm for CVaR MDPs that enjoys error guarantees. Finally, we present results from numerical experiments that corroborate our theoretical findings and show the practicality of our approach.
Key facts. Cited by 162 papers in the map (data through 7 Oct 2026). First posted on arXiv 6 Jun 2015.
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Citing papers per year: 2019: 1; 2020: 2; 2021: 28; 2022: 25; 2023: 26; 2024: 20; 2025: 30; 2026: 30.
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- 2026Robust Policy Optimization to Prevent Catastrophic Forgetting9 Feb 2026
- 2025Constrained Language Model Policy Optimization via Risk-aware Stepwise Alignment30 Dec 2025
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- 2026Risk-Averse Online POMDP Planning via CVaR of the Immediate Cost with Performance Guarantees26 Sep 2026
- 2026Learning Chance-Constrained MDPs with Bellman Distributional Certificates25 Sep 2026
- 2026Robust Policy Optimization via Adversarial Importance Sampling11 Sep 2026
- 2026Proactive Context-Forecasted Safety Constraints for Nonstationary Reinforcement Learning8 Sep 2026
- 2026Risk-Conditioned Fine-Tuning of Large Language Models8 Sep 2026
- 2026Robust Risk Under Evolving Uncertainty: A Wasserstein Counterpart of the Entropic Value-at-Risk19 Aug 2026
- 2026Long-Term Sequential Decision Making under Risk22 Jul 2026
- 2026SteinGate: Tail-Sensitive Safe Reinforcement Learning via Stein Discrepancy14 Jul 2026
- 2026Risk-Aware General-Utility Markov Decision Processes10 Jul 2026
- 2026OrderGrad: Optimizing Beyond the Mean with Order-Statistic Policy Gradient Estimation4 Jun 2026
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