code: def net_dummy(self):
      from skorch import NeuralNet
  
      net = Mock(spec=NeuralNet)
      net.lr = 0.01
      return net
  
file_path: skorch/skorch/tests/test_setter.py
imports: from unittest.mock import Mock
  import pytest
label_desc: Use image node_id 1 for calling the TestOptimizerSetter obj's underlying member method code with example usage: obj.net_dummy() and returns: net