Why is DDPG an off-policy method while policy gradient is by definition on-policy?
DDPG is updated in an off-policy manner while policy gradient is on-policy. So DDPG is not a policy gradient method?
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what do you mean by DDPG? – tortue May 22 '19 at 14:57
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Deep Deterministic Policy Gradient – ccc Jun 19 '19 at 13:00