Pytorchloader and some pytorch examples (#2318)
Pytorchloader and some pytorch examples (#2318)

* pytorch loader

* some fix

* update to distributed sampler

* add distributedseqsampler

* some clean up

* delete size

* update example

* Create README.md

* Update README.md

* update example

* update example

* some update

* some change

* fix python style check

* Update README.md

* some update

* meet code review

* clean up

* some update

* some fix

* update main.py

* Update README.md

* some update

* meet code review

* some fix

* fix unit test

* fix ut

* add toto

* fix rebase
intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL