Remove spurious memo argument in Module.parameters() (pytorch#1527)

Author: wjaskowski

torch/nn/modules/module.py

@@ -338,7 +338,7 @@ def load_state_dict(self, state_dict):
  if len(missing) > 0:
  raise KeyError('missing keys in state_dict: "{}"'.format(missing))
 
- def parameters(self, memo=None):
+ def parameters(self):
  """Returns an iterator over module parameters.
 
  This is typically passed to an optimizer.