code: def variables(self):
      # Avoiding relying on implicit tracking since
      # CompileMetrics may be instantiated or built in a no tracking scope.
      if not self.built:
          return []
      vars = []
      for m in self._flat_metrics + self._flat_weighted_metrics:
          if m is not None:
              vars.extend(m.variables)
      return vars
  
imports: import tree
  from keras import backend
  from keras import losses
  from keras import metrics
  from keras import ops
  from keras.utils.naming import get_object_name
label_desc: Use image node_id 3 for calling the CompileMetrics obj's underlying member method code with example usage: obj.variables() and returns: vars, list