code: def experimental_feature_scope(feature_name):
      """Creates a context manager to enable the given experimental feature.
  
      This helper function creates a context manager setting up an experimental
      feature temporarily.
  
      Example:
  
      ```python
      with self._experimental_feature_scope("feature_1"):
        do_smthg()
      ```
  
      Args:
        feature_name: Name of the feature being tested for activation.
      """
  
      env_varname = "TF_TRT_EXPERIMENTAL_FEATURES"
      env_value_bckp = os.environ.get(env_varname, default="")
  
      exp_features = env_value_bckp.split(",")
      os.environ[env_varname] = ",".join(
          list(set(exp_features + [feature_name]))
      )
  
      try:
          yield
      finally:
          os.environ[env_varname] = env_value_bckp
  
label_desc: Use image node_id 1 for calling a global function with example usage: experimental_feature_scope(feature_name) without return types