def _step_input_paths(self):
        if self._prev_outfiles:
            return self._prev_outfiles
        else:
            return self._get_input_paths()
Decide where to get input for a step. Dump stdin to a temp file
dataset/ETHPy150Open Yelp/mrjob/mrjob/sim.py/SimMRJobRunner._step_input_paths