code: def call(self, loop_vars):
      return backend.core.while_loop(
          self.cond,
          self.body,
          loop_vars,
          maximum_iterations=self.maximum_iterations,
      )
  
imports: import numpy
  from keras import backend
  from keras.api_export import keras_export
  from keras.backend import KerasTensor
  from keras.backend import any_symbolic_tensors
  from keras.ops.operation import Operation
  from keras.utils import traceback_utils
label_desc: Use image node_id 2 for calling the WhileLoop obj's underlying member method code with example usage: obj.call(loop_vars) and returns: backend