update Torch example (#3022)
update Torch example (#3022)

* update example

* Update README.md

* update resnet_finetune.py

* delete some file

* Create README.md

* Update README.md

* Update README.md

* Update README.md

* add detect conda env name

* some change

* update run example scripte

* update init orca context
yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL