Add set input output format API in Python (#2880)
Add set input output format API in Python (#2880)

* add set input output format

* add static graph check

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