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* [bf16] add bf16 support for fused adam (#3844)

* [bf16] fused adam kernel support bf16

* [test] update fused adam kernel test

* [test] update fused adam test

* [bf16] cpu adam and hybrid adam optimizers support bf16 (#3860)

* [bf16] implement mixed precision mixin and add bf16 support for low level zero (#3869)

* [bf16] add mixed precision mixin

* [bf16] low level zero optim support bf16

* [text] update low level zero test

* [text] fix low level zero grad acc test

* [bf16] add bf16 support for gemini (#3872)

* [bf16] gemini support bf16

* [test] update gemini bf16 test

* [doc] update gemini docstring

* [bf16] add bf16 support for plugins (#3877)

* [bf16] add bf16 support for legacy zero (#3879)

* [zero] init context support bf16

* [zero] legacy zero support bf16

* [test] add zero bf16 test

* [doc] add bf16 related docstring for legacy zero

* [test] added spawn decorator

* polish code

* polish code

* polish code

* polish code

* polish code

* polish code

* [zero] refactor low-level zero folder structure

* [zero] fix legacy zero import path

* [zero] fix legacy zero import path

* [zero] remove useless import

* [zero] refactor gemini folder structure

* [zero] refactor gemini folder structure

* [zero] refactor legacy zero import path

* [zero] refactor gemini folder structure

* [zero] refactor gemini folder structure

* [zero] refactor gemini folder structure

* [zero] refactor legacy zero import path

* [zero] fix test import path

* [zero] fix test

* [zero] fix circular import

* [zero] update import

* [zero] add strict ddp mode for chunk init

* [gemini] update gpt example

* [gemini] polish code

* [testing] remove code

* [gemini] make more robust

* [testing] add beit model

* [beit] fix bugs

* [beit] fix bugs

* [testing] fix bugs

* [zero] add L2 gradient clipping

* [testing] add MlpModel

* [zero] add unit test for grad clipping

* fix atol

* [gemini] fix init bugs for modules

* fix bugs

* [Gemini] more tests for Gemini

* polish code

* [hotfix] fix zero's incompatibility with checkpoint in torch-1.12

* [zero] add cpu shard init

* [zero] add tiny example test

* [colo_tensor] fix bugs for torch-1.11

* add chunk manager init function

* fix unit tests

* add comment

* add flush=True

* fixes memory leak when paramter is in fp16 in ZeroDDP init.
* bans chunk releasement in CUDA. Only when a chunk is about to offload, it is allowed to release.
* adds a constant placement policy. With it, users can allocate a reserved caching memory space for parameters.

This reverts commit 5be118f4.