* refactor low level zero
* fix zero2 and support cpu offload
* avg gradient and modify unit test
* refactor grad store, support layer drop
* refactor bucket store, support grad accumulation
* fix and update unit test of zero and ddp
* compatible with tp, ga and unit test
* fix memory leak and polish
* add zero layer drop unittest
* polish code
* fix import err in unit test
* support diffenert comm dtype, modify docstring style
* polish code
* test padding and fix
* fix unit test of low level zero
* fix pad recording in bucket store
* support some models
* polish
* [plugin] torch ddp plugin add save sharded model
* [test] fix torch ddp ckpt io test
* [test] fix torch ddp ckpt io test
* [test] fix low level zero plugin test
* [test] fix low level zero plugin test
* [test] add debug info
* [test] add debug info
* [test] add debug info
* [test] add debug info
* [test] add debug info
* [test] fix low level zero plugin test
* [test] fix low level zero plugin test
* [test] remove debug info
* [test] fix flop tensor test
* [test] fix autochunk test
* [test] fix lazyinit test
* [devops] update torch version of CI
* [devops] enable testmon
* [devops] fix ci
* [devops] fix ci
* [test] fix checkpoint io test
* [test] fix cluster test
* [test] fix timm test
* [devops] fix ci
* [devops] fix ci
* [devops] fix ci
* [devops] fix ci
* [devops] force sync to test ci
* [test] skip fsdp test
* fix spelling error with examples/comminity/
* fix spelling error with tests/
* fix some spelling error with tests/ colossalai/ etc.
* fix spelling error with tests/ etc. date:2023.5.10
* [booster] fix no_sync method
* [booster] add test for ddp no_sync
* [booster] fix merge
* [booster] update unit test
* [booster] update unit test
* [booster] update unit test
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