Change "gain" -> "calculate_gain" (#192)

Fixes #189 (comment)

Author: Kaixhin

super_resolution/model.py

@@ -24,7 +24,7 @@ def forward(self, x):
  return x
 
  def _initialize_weights(self):
- init.orthogonal(self.conv1.weight, init.gain('relu'))
- init.orthogonal(self.conv2.weight, init.gain('relu'))
- init.orthogonal(self.conv3.weight, init.gain('relu'))
+ init.orthogonal(self.conv1.weight, init.calculate_gain('relu'))
+ init.orthogonal(self.conv2.weight, init.calculate_gain('relu'))
+ init.orthogonal(self.conv3.weight, init.calculate_gain('relu'))
  init.orthogonal(self.conv4.weight)