def download_files(self):
        return NotImplementedError()
Uses CSVFile and ExtractColumn to load strings.
dataset/ETHPy150Open NVIDIA/DIGITS/digits/model/job.py/ModelJob.download_files--crossover with--dataset/ETHPy150Open VisTrails/VisTrails/vistrails/packages/tabledata/read/read_csv.py/CSVTestCase.test_csv_nonnumeric