def post_optimization_step(self, batch_info, device, model, rollout):
<EOL>for model_param, target_param in zip(model.parameters(), self.target_model.parameters()):<EOL><INDENT>target_param.data.mul_(<NUM_LIT:1> - self.tau).add_(model_param.data * self.tau)<EOL><DEDENT>
Steps to take after optimization has been done