code: def net_optim_dummy(self, net_dummy, optimizer_dummy):
      net_dummy.optimizer_ = optimizer_dummy
      return net_dummy
  
file_path: skorch/skorch/tests/test_setter.py
imports: from unittest.mock import Mock
  import pytest
label_desc: Use image node_id 3 for calling the TestOptimizerSetter obj's underlying member method code with example usage: obj.net_optim_dummy(net_dummy, optimizer_dummy) and returns: net_dummy