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Aritra Mitra

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#machine learning Preprint Oct 2026

Learning from Unreliable Trajectories: Adversarially-Robust Federated Q-Learning

We study federated reinforcement learning in which multiple agents interact with a common Markov decision process and communicate through a central server to collaboratively learn the optimal state-action value function. Our goal is to understand whether the sample-efficiency benefits of collaboration can be retained w...

Sreejeet Maity, Aritra Mitra · 0 citations
#machine learning Conference May 2026

Robust Federated Q-Learning with Almost No Communication

A federated Q-learning algorithm that blends ideas from both model-based and model-free RL, along with the median-of-means device from robust statistics, which guarantees exact convergence to the optimal value function in the limit of infinite samples and enjoys near-optimal finite-time rates that benefit from collabor...

Sreejeet Maity, Aritra Mitra · 1 citation
Conference May 2026

Variance-Reduced Q-Learning over Static and Time-Varying Networks

It is proved that such speedups in sample-complexity require only $\tilde O\left( 1 \right)$ communication, substantially improving upon the communication costs in prior work.

Sreejeet Maity, Feng Zhu, Aritra Mitra et al. · 0 citations
#machine learning Preprint Sep 2026

High-Probability Convergence of SGD via Batched Updates

This work proposes Batched SGD, a simple variant that partitions online samples into epochs and performs a single update per epoch using a refined, low-variance gradient estimate, and provides the first high-probability guarantees for FL.

Feng Zhu, Robert W. Heath, Aritra Mitra · 0 citations

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