Discussion
What is the role of the critic in a learning agent?
Answer: B
The critic observes the percepts and reports performance against a fixed external standard, since the agent's own utility function cannot be used to judge whether that utility function is right. Without an external standard the agent could improve its score by changing its opinion of what counts. Architecture, algorithm selection and exploration belong elsewhere. Requiring the feedback to come from outside the system being improved is what makes the learning meaningful.
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