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Reinforce Policy Update wrong #722

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Reinforce Policy Update wrong #722

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7 changes: 3 additions & 4 deletions reinforcement_learning/reinforce.py
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Original file line number Diff line number Diff line change
Expand Up @@ -68,10 +68,9 @@ def finish_episode():
returns.insert(0, R)
returns = torch.tensor(returns)
returns = (returns - returns.mean()) / (returns.std() + eps)
for log_prob, R in zip(policy.saved_log_probs, returns):
policy_loss.append(-log_prob * R)
optimizer.zero_grad()
policy_loss = torch.cat(policy_loss).sum()
l_probs = policy.saved_log_probs.sum()
rews = returns.sum()
policy_loss = rews + l_probs
policy_loss.backward()
optimizer.step()
del policy.rewards[:]
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