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March 19, 2019 23:05
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Actor Critic
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def update(self, states, actions, rewards): | |
values = self.critic(states) | |
advantage = reward - values | |
action_probs = self.actor(states) | |
selected_action_probs = action_probs[self.to_one_hot(actions)] | |
neg_logs = - log(selected_action_probs) | |
# If backprop executed, gradient of policy_loss will affect critic! | |
policy_loss = reduce_mean(neg_logs * advantages) | |
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