What type of machine learning is used to train an AI robot that learns optimal package delivery routes through feedback on its performance?

The chosen answer, reinforcement learning, is suitable for this scenario because it involves training an AI system to make a sequence of decisions by learning from the consequences of its actions. In this case, the AI robot learns optimal package delivery routes through a process where it receives feedback based on its performance. If the robot successfully delivers packages more efficiently, it can be rewarded, reinforcing the behavior that led to that success. Conversely, if the robot makes mistakes or takes longer routes, it may receive negative feedback, prompting adjustments in its strategy for future deliveries.

Reinforcement learning is particularly effective in environments where optimal solutions depend on a series of actions and outcomes, making it the ideal choice for navigating routes based on dynamically changing conditions or varying factors that could influence delivery efficiency.