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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_config(self):
 """Load the workflow stage config from the database."""

        pb_key = SchedulingObject.get_key(PB_KEY, self._pb_id)
        stages = DB.get_hash_value(pb_key, 'workflow_stages')
        stages = ast.literal_eval(stages)
        return stages[self._index]