Shaping Rewards For Sparse Reward Environments

# Shaping Rewards For Sparse Reward Environments: A Comprehensive Guide Imagine teaching a robot to make a sandwich. If you only reward the robot when it *perfectly* completes the sandwich, it might wander aimlessly forever without ever getting positive feedback. This is the challenge of **sparse reward environments** in reinforcement learning (RL). In these scenarios, the agent rarely receives a reward signal, making learning incredibly difficult. Fortunately, there's a powerful technique cal