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For question involving probability as related to AI methods. (This tag is for general usage. Feel free to utilize in conjunction with the "math" and more specific probability tags.)
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In RL as probabilistic inference, why do we take a probability to be $\exp(r(s_t, a_t))$?
After doing some further reading, it turns out that negative rewards are an assumption for this distribution to hold. However, the author notes that as long as you don't receive a reward of infinity f …
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How does $\mathbb{E}$ suddenly change to $\mathbb{E}_{\pi'}$ in this equation?
This is because in this instance $\pi '(s)$ is a deterministic policy, i.e. in state $s$ the policy will take action $b$ with probability 1 and all other actions with probability 0. …