Research on Multi-agent Sparse Reward Problem

Sparse reward poses a significant challenge in deep reinforcement learning, leading to issues such as low sample utilization, slow agent convergence, and subpar performance of optimal policies. Overcoming these challenges requires tackling the complexity of sparse reward algorithms and addressing the lack of unified understanding. This paper aims to address these issues by introducing the concepts of reinforcement learning and sparse reward, as well as presenting three categories of sparse reward algorithms. Furthermore, the paper conducts an analysis and summary of three key aspects: manual labeling, hierarchical reinforcement learning, and the incorporation of intrinsic rewards. Hierarchical reinforcement learning is further divided into option-based and subgoal-based methods. The implementation principles, advantages, and disadvantages of all algorithms are thoroughly examined. In conclusion, this paper provides a comprehensive review and offers future directions for research in this field.