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* add chunk manager init function

* fix unit tests

* add comment

* add flush=True

This reverts commit 5be118f4.

* process group supports getting ranks in group

* chunk mgr receives a process group

* update unit test

* fix unit tests

* ColoDDP supports overwriting default process group

* rename ColoDDPV2 to ZeroDDP

* add docstr for ZeroDDP

* polish docstr

* fix param op hook

* update zero tp test

* fix bugs

* update gemini mgr

* update chunk

* add docstr

* polish placement policy

* update test chunk

* update test zero

* polish unit test

* remove useless unit test

* add placement policy

* add gemini mgr

* update mem stats collector

* update zero

* update zero optim

* fix bugs

* zero optim monitor os

* polish unit test

* polish unit test

* add assert

* add zero optimizer

* torch ok

* unit test ok

* polish code

* fix bugs

* polish unit test

* polish zero optim

* polish colo ddp v2

* refactor folder structure

* add comment

* polish unit test

* polish zero optim

* polish unit test

* impl chunk manager

* impl param op hook

* add reduce_chunk

* add zero hook v2

* add zero dp

* fix TensorInfo

* impl load balancing when using zero without chunk

* fix zero hook

* polish chunk

* fix bugs

* ddp ok

* zero ok

* polish code

* fix bugs about load balancing

* polish code

* polish code

* add ene-to-end test

* polish code

* polish code

* polish code

* fix typo

* add test_chunk

* fix bugs

* fix bugs

* polish code

* impl ColoDDP for ColoTensor

* polish code

* refactor parallel action

* polish unit tests

* polish test_gpt

* update op unit tests

* update test model

* refactor colo-tensor and update linear op

* polish code

* polish code

* update ops and unit tests

* update unit tests

* polish code

* rename dist_spec module

* polish code

* polish code

* remove unneeded import

* fix pipelinable