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How to check the Q(s,a) value from a trained DQN agent?

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Yichen Hu
Yichen Hu 2019-9-24
回答： Kajal Bansala 2021-3-10
I have trained a DQN agent using the new Reinforcement Learning toolbox. And I wonder if it's possible to check the Q value of a certain (s,a) pair?

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Kajal Bansala
Kajal Bansala 2021-3-10
Hello Yichen,
You can extract the 'rlQValueRepresentation' critic from the 'rlDQNAgent' using 'getCritic()'. From there you can use 'getValue()' to get the value for the observation. Here are my documentation page references:
getCritic: https://www.mathworks.com/help/reinforcement-learning/ref/rl.agent.rlqagent.getcritic.html
getValue: https://www.mathworks.com/help/reinforcement-learning/ref/getvalue.html
rlQValueRepresentation: https://www.mathworks.com/help/reinforcement-learning/ref/rlqvaluerepresentation.html
rlDQNAgent: https://www.mathworks.com/help/reinforcement-learning/ref/rldqnagent.html

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