code: def _instance_to_test(self):
      return RMSPropTF
  
file_path: ClassyVision/test/optim_rmsprop_tf_test.py
imports: import unittest
  from classy_vision.optim.rmsprop_tf import RMSPropTF
  from test.generic.optim_test_util import TestOptimizer
label_desc: Use image node_id 2 for calling the TestRMSPropTFOptimizer obj's underlying member method code with example usage: obj._instance_to_test() and returns: RMSPropTF