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20242026
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cs.LG2026

Finite-Time Analysis of Discounted Exponential-Utility Reinforcement Learning

Ankur Naskar, Vivek T A, Aditya Kumar +2

Discounted exponential utility provides a principled criterion for risk-sensitive sequential decision-making, but its nonlinear structure complicates reinforcement learning. A rece…

cs.LG2026

Adversary-Robust Learning from Fully Asynchronous Directional Derivative Estimates

Anik Kumar Paul, Nibedita Roy, Nagesh Talagani +3

We propose FAR-SIGN (Fully Asynchronous Robust optimization via SIGNed directional projections) for adversary-resilient learning in parameter-server--worker systems. FAR-SIGN achie…

cs.LG2026

Reinforcement Learning for Exponential Utility: Algorithms and Convergence in Discounted MDPs

Gugan Thoppe, L. A. Prashanth, Ankur Naskar +1

Reinforcement learning (RL) for exponential-utility optimization in discounted Markov decision processes (MDPs) lacks principled value-based algorithms. We address this gap in the…

cs.LG2026

Monotone and Conservative Policy Iteration Beyond the Tabular Case

S. R. Eshwar, Gugan Thoppe, Ananyabrata Barua +2

We introduce Reliable Policy Iteration (RPI) and Conservative RPI (CRPI), variants of Policy Iteration (PI) and Conservative PI (CPI), that retain tabular guarantees under function…

cs.LG2026

Parameter-free Optimal Rates for Nonlinear Semi-Norm Contractions with Applications to -Learning

Ankur Naskar, Gugan Thoppe, Vijay Gupta

Algorithms for solving \textit{nonlinear} fixed-point equations -- such as average-reward \textit{-learning} and \textit{TD-learning} -- often involve semi-norm contractions. Ac…

cs.LG2025

Parameter-Free Federated TD Learning with Markov Noise in Heterogeneous Environments

Ankur Naskar, Gugan Thoppe, Utsav Negi +1

Federated learning (FL) can dramatically speed up reinforcement learning by distributing exploration and training across multiple agents. It can guarantee an optimal convergence ra…