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* make it faster

* [hotfix] torchvison fx tests

* [hotfix] rename duplicated named test_gpt.py

* make it faster

* [tensor] rename convert_to_dist -> redistribute

* [tensor] ShardSpec and ReplicaSpec

* [tensor] redistribute among diff pgs

* polish code

* init a checkpoint dir

* [checkpoint]support resume for cosinewarmuplr

* [checkpoint]add unit test

* fix some bugs but still not OK

* fix bugs

* make it faster

* [checkpoint]support generalized scheduler

* polish

* [tensor] torch function return colotensor

* polish

* fix bugs

* remove debug info

* polish

* polish

* [tensor] test_model pass unittests

* polish

* [hotfix] fx get comm size bug
Co-authored-by: ZhaoYi1222 <zhaoyi9499@gmail.com>

* add more element-wise ops

* update test_op

* polish unit test

* dist spec s2s uses all-to-all

* update unit test

* add sanity check

* polish unitest test with titans

* add sanity check for DistMgr

* add sanity check
Co-authored-by: jiaruifang <fangjiarui123@gmail.com>

* 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