What are sparse and dense reward functions?

Can you explain what sparse and dense reward functions are?

Sure! Sparse reward functions provide feedback only at specific intervals, while dense reward functions give feedback more frequently.

What are some examples of each type?

An example of a sparse reward function is a game where you only get points for completing a level. A dense reward function might give points for every action you take.

Which one is better for training AI?

It depends on the task. Sparse rewards can be challenging but encourage exploration, while dense rewards can speed up learning.

How do these functions affect learning efficiency?

Sparse rewards can lead to longer training times due to less frequent feedback, while dense rewards can provide more guidance, potentially speeding up learning.