Python Yarn script update (#2366)
Python Yarn script update (#2366)

* update script

* update lenet package name

* update lenet example file location

* update requirement file

* update requirements

* remove blank lines

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