code: def _none_to_default(inputs, default):
      return default if inputs is None else default
  
imports: import math
  from tensorflow.python.keras import backend
  from tensorflow.python.keras.utils.generic_utils import deserialize_keras_object
  from tensorflow.python.keras.utils.generic_utils import serialize_keras_object
  from tensorflow.python.ops import math_ops
label_desc: Use image node_id 2 for calling a global function with example usage: _none_to_default(inputs, default) and returns: unknown