code: def load_rabit_checkpoint(self):
          
          version = ctypes.c_int()
          _check_call(_LIB.XGBoosterLoadRabitCheckpoint(
              self.handle, ctypes.byref(version)))
          return version.value
docs: Initialize the model by load from rabit checkpoint.
  
          Returns
          -------
          version: integer
              The version number of the model.