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* [pipeline inference] pipeline inference (#4492)

* add pp stage manager as circle stage

* fix a bug when create process group

* add ppinfer basic framework

* add micro batch manager and support kvcache-pp gpt2 fwd

* add generate schedule

* use mb size to control mb number

* support generate with kv cache

* add output, remove unused code

* add test

* reuse shardformer to build model

* refactor some code and use the same attribute name of hf

* fix review and add test for generation

* remove unused file

* fix CI

* add cache clear

* fix code error

* fix typo

* [Pipeline inference] Modify to tieweight (#4599)

* add pp stage manager as circle stage

* fix a bug when create process group

* add ppinfer basic framework

* add micro batch manager and support kvcache-pp gpt2 fwd

* add generate schedule

* use mb size to control mb number

* support generate with kv cache

* add output, remove unused code

* add test

* reuse shardformer to build model

* refactor some code and use the same attribute name of hf

* fix review and add test for generation

* remove unused file

* modify the way of saving newtokens

* modify to tieweight

* modify test

* remove unused file

* solve review

* add docstring

* [Pipeline inference] support llama pipeline inference (#4647)

* support llama pipeline inference

* remove tie weight operation

* [pipeline inference] Fix the blocking of communication when ppsize is 2 (#4708)

* add benchmark verbose

* fix export tokens

* fix benchmark verbose

* add P2POp style to do p2p communication

* modify schedule as p2p type when ppsize is 2

* remove unused code and add docstring

* [Pipeline inference] Refactor code, add docsting, fix bug (#4790)

* add benchmark script

* update argparse

* fix fp16 load

* refactor code style

* add docstring

* polish code

* fix test bug

* [Pipeline inference] Add pipeline inference docs (#4817)

* add readme doc

* add a ico

* Add performance

* update table of contents

* refactor code (#4873)