GitLab

* add WAR for pip>=19.3.1

* remove pipmain, use extras_require instead

Made the patched optimizer step function a full method, not simply a function stored as an instance member (#553)

* move previous fused_adam and fp16_optimizer to contrib

* make build contrib.fused_adam optional

* change build option name

* remove unnecessary try import

* increase atol for Half-Float comparison to 1.5e-4

* disable tests for different opt_levels

* reset atol

* add bitwise accurate comparison

* Pushing for build tests

* Contrib files

* Removing deprecated checks

Remove torch.autograd.Variable

* move import of amp_C to __init__()

* make fp16/32 separate lists to support mixed param types, disable double test

* make zero_grad consistent between adam/novograd/lamb

* add state_dict, load_state_dict

* add test_restoring, test_loss_scale_decrease

* disable amp outputs for checkpoint tests

* add test for amp.state_dict, cleanup

* add state_dict patch, add test

* fixed testing, cleanup

* add readme for checkpointing

* add docs to source/amp

* add review changes to doc