code: def get(identifier):
      """Retrieve a regularizer instance from a config or identifier."""
      if identifier is None:
          return None
      if isinstance(identifier, dict):
          return deserialize(identifier)
      elif isinstance(identifier, str):
          return deserialize(str(identifier))
      elif callable(identifier):
          return identifier
      else:
          raise ValueError(
              "Could not interpret regularizer identifier: {}".format(
                  identifier
              )
          )
  
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 6 for calling a global function with example usage: get(identifier) and returns: None, deserialize, deserialize, identifier