GitLab

* add tensor placement policies

* polish comments

* polish comments

* update moe unit tests

* fixed bugs of assigning grad states to non leaf nodes

* use detach()

* adapt post grad hooks for not-shard parameters
* adapt optimizer for not-shard parameters
* offload gradients for not-replicated parameters

* refactor memstats collector

* fix disposable

* polish code

* add PaLM link

* [WIP] stateful tensor manager

* add eviction strategy

* polish code

* polish code

* polish comment

* add unit test

* fix sampler bug

* polish code

* fix max sampling cnt resetting bug

* fix sampler bug

* polish code

* fix bug

* fix unit test
Co-authored-by: jiaruifang <fangjiarui123@gmail.com>

Co-authored-by: github-actions <github-actions@github.com>

Co-authored-by: github-actions <github-actions@github.com>