implementation detail question about MAMLPPO

[seolhokim]

Hi, Thank you for providing the quality code. I have a implementation detail question.

1. Why don't you just call optimizer.step() after meta_objective.backward()?

garage/src/garage/torch/algos/maml.py

Lines 124 to 127 in f056fb8

	self._meta_optimizer.zero_grad()
	meta_objective.backward()
	self._meta_optimize(all_samples, all_params)