code: def model_from_yaml(yaml_string, custom_objects=None):
      """Parses a yaml model configuration file and returns a model instance.
  
      Note: Since TF 2.6, this method is no longer supported and will raise a
      RuntimeError.
  
      Args:
          yaml_string: YAML string or open file encoding a model configuration.
          custom_objects: Optional dictionary mapping names
              (strings) to custom classes or functions to be
              considered during deserialization.
  
      Returns:
          A Keras model instance (uncompiled).
  
      Raises:
          RuntimeError: announces that the method poses a security risk
      """
      raise RuntimeError(
          "Method `model_from_yaml()` has been removed due to security risk of "
          "arbitrary code execution. Please use `Model.to_json()` and "
          "`model_from_json()` instead."
      )
  
imports: from tensorflow.python.keras.saving.saved_model import json_utils
label_desc: Use image node_id 2 for calling a global function with example usage: model_from_yaml(yaml_string, custom_objects) without return types