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- fixes #471
- one less thing to worry about during development.

- added DDP equivalency test
- added rmf, state_dict_norm functions to testing utils
- added more debugging output to objects_are_equal

* re-activating unit test
* removing changed that slipped in

Co-authored-by: Min Xu <24926999+min-xu-ai@users.noreply.github.com>

* Add new test for weight init (fails)
* Set FSDP.compute_device so summon_full_params works before module moves to CUDA
* Override FSDP.apply to enable custom weight init

* param buckets
* unifying the buckets

* extracting the buckets in a dedicated class, fixing the resize_ bug
* adding a unit test
* copyright

* enabling disabled tests

* [feat] FSDP: add auto_wrap_bn

- add an utility function to handle wrapping of BN

* changelog

* [feature] FSDP: enable pytorch SyncBN

- not fully validated yet but at least not asserting
- this enables VISSL to move forward with its next PR

* add the test file

* changelog and lint

* addressed comment

* debugging statements

* fix index inputs and streams

* fix lint errors

* remove print

* lint errors

* address comments

* lint error
Co-authored-by: Anjali Sridhar <anj@devfair0443.h2.fair>

* Deactivating buckets for a single rank, not crashing but not useful

* extending the current state_dict interface, make it possible to do everything in a single call, and to checkpoint on all ranks

* FSDP: multi-pass autograd graph and mixed precision

- added BACKWARD_PRE/POST checking
- better assert_state
- fixed issue of backward hook misfiring

* fix

* cleanup

* Update fairscale/nn/data_parallel/fully_sharded_data_parallel.py
Co-authored-by: Myle Ott <myleott@fb.com>
Co-authored-by: Myle Ott <myleott@fb.com>

* Adding a hard sync barrier before the broadcast, mostly useful for Gloo actually, NCCL is synced behind the scene
* adding a proper unit test
* adding a unit test for https://github.com/facebookresearch/fairscale/pull/510

* experimental: Add spectrain support

* Address review comments

* Address review comments

* seemingly fix flakyness for gloo by checking all coms handles

* smal fix, remove unused flags

* remove usused flag

* add back max_batch flag

* adding back lazy_construction

* adding back lazy_construction

* add missing device arg
Co-authored-by: Anjali Sridhar <anj@devfair0443.h2.fair>

* [chore] 0.3.1 release

- mainly because vissl needs the new version
- added a doc on release steps

* Update CHANGELOG.md
Co-authored-by: anj-s <32556631+anj-s@users.noreply.github.com>

* review comments
Co-authored-by: anj-s <32556631+anj-s@users.noreply.github.com>