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Is (log-)standard deviation learned in TRPO and PPO or fixed instead?

Using PPO from stable baselines 3, I see clearly that the variance of the actions are reducing in the environment I am using, where the optimal actions are static and not dependent on the state. This ...
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How to use RL on a robotic moving arm?

The core part of RL is the reward function. It belongs to the environment and it is the only way the agent can explore the world given a state. By constructing an appropriate reward function we can ...

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