support create featureset from pytorch dataloader creator functions. (#2630)
support create featureset from pytorch dataloader creator functions. (#2630)


yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL