(۱۱ اردیبهشت ۱۳۹۲ ۰۱:۴۲ ب.ظ)atharrashno نوشته شده توسط:  من این سوال را چندین بار جواب هایی براش پیدا کرده ام اما به طور عینی واقعا نمیفهمم دقیقا این تفاوت از کجا ناشی میشه
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They can be the same but do not have to be. The performance function is used externally to measure the agent’s performance. The utility function is used internally (by the agent) to measure (or estimate) it’s performance. There is always a performance function but not always an utility function (cf. random agent).



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A performance measure embodies the criterion for the success of an agent's behavior whereas a utility function maps a state onto a real number, which describes the associated degree of happiness. As a general rule, it is better to design performance measures according to what one actually wants in the environment, rather than according to how one thinks the agent should behave whereas utility function are programs to handle the uncertainty inherent in partially observable environment.