add channel_last and remove transpose

fix config.py label_smoothing parameter wrong spell

Add xla option

Merge branch 'bert_with_xla' of https://github.com/Oneflow-Inc/OneFlow-Benchmark into add_xla_option

udate scripts and readme for new optimizer api

Dev cnns new optimizers

replace warning function >> flow.image.Resize()  with new api

refine cnn readme

print time stamp

restore snapshot.save