Q$ Learning Algorithm
Q-learning is a reinforcement learning algorithm aiming to find optimal action-selection policies by iteratively estimating the expected cumulative reward (Q-value) for each state-action pair. Current research focuses on improving Q-learning's robustness and efficiency, particularly through techniques like distributionally robust optimization, knowledge transfer from related tasks, and the use of function approximation (e.g., linear architectures and nearest neighbors) to handle large state spaces. These advancements enhance the algorithm's applicability to complex real-world problems in diverse fields such as marketing, healthcare, and robotics, while also addressing challenges like instability and sample inefficiency. The development of provably convergent and efficient Q-learning variants is a significant area of ongoing investigation.