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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def load_rabit_checkpoint(self):
 """Initialize the model by load from rabit checkpoint. Returns ------- version: integer The version number of the model. """

        version = ctypes.c_int()
        _check_call(_LIB.XGBoosterLoadRabitCheckpoint(
            self.handle, ctypes.byref(version)))
        return version.value