collaborators

5 papers

cs.LG2026

TraCeS: Learning Per-Timestep Constraint-Violation Credit from Sparse Trajectory-Level Labels

Siow Meng Low, Ze Gong, Akshat Kumar

Ensuring safe behavior in reinforcement learning (RL) is challenging when safety constraints are implicit and cannot be densely measured. In many settings, supervision is limited t…

cs.LG2026

Beyond Hard Constraints: Budget-Conditioned Reachability For Safe Offline Reinforcement Learning

Janaka Chathuranga Brahmanage, Akshat Kumar

Sequential decision making using Markov Decision Process underpins many realworld applications. Both model-based and model free methods have achieved strong results in these settin…

cs.AI2025

Offline Safe Policy Optimization From Heterogeneous Feedback

Ze Gong, Pradeep Varakantham, Akshat Kumar

Offline Preference-based Reinforcement Learning (PbRL) learns rewards and policies aligned with human preferences without the need for extensive reward engineering and direct inter…

cs.LG2025

Offline Safe Reinforcement Learning Using Trajectory Classification

Ze Gong, Akshat Kumar, Pradeep Varakantham

Offline safe reinforcement learning (RL) has emerged as a promising approach for learning safe behaviors without engaging in risky online interactions with the environment. Most ex…

cs.LG2025

Leveraging Constraint Violation Signals For Action-Constrained Reinforcement Learning

Janaka Chathuranga Brahmanage, Jiajing Ling, Akshat Kumar

In many RL applications, ensuring an agent's actions adhere to constraints is crucial for safety. Most previous methods in Action-Constrained Reinforcement Learning (ACRL) employ a…