class_docstr: Control the execution of the test in TF1.x and TF2.
  
  If TF2 is enabled then a test with TF1 test is going to be skipped and vice
  versa.
  
  Test targets continuously run in TF2 thanks to the tensorflow.v2 TAP target.
  A test can be run in TF2 with bazel by passing --test_env=TF2_BEHAVIOR=1.
code: def parameter_modifiers(self):
      return [test_combinations.OptionalParameter("tf_api_version")]
  
file_path: tensorflow-upstream/tensorflow/python/framework/combinations.py
imports: import functools
  from tensorflow.python import tf2
  from tensorflow.python.eager import context
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_combinations
  from tensorflow.python.util.tf_export import tf_export
label_desc: Use image node_id 2 for calling the TFVersionCombination obj's underlying member method code with example usage: obj.parameter_modifiers() and returns: list