fix test for dlclassifier (#1715)
fix test for dlclassifier (#1715)

* fix test

* style

* precision

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