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* fix PEFT + gradient checkpointing

* add disable RG

* polish tests

* fix comment

* Revert "fix comment"

This reverts commit b85386f50d2b104bac522e823c47b7e232116a47.

* final explanations and tests

fix save_pretrained issue + add test

* a draft version

* v2 integration

* fix

* make it more generic and works for IA3

* add set adapter and multiple adapters support

* fixup

* adapt a bit

* oops

* oops

* oops

* adapt more

* fix

* add more refactor

* now works with model class

* change it to instance method as it causes issues with `jit`.

* add CR

* change method name

* add `add_adapter` method

* clean up

* Update src/transformers/adapters/peft_mixin.py
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* add moe utils

* fixup

* Update src/transformers/adapters/peft_mixin.py
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* adapt

* oops

* fixup

* add is_peft_available

* remove `requires_backend`

* trainer compatibility

* fixup + docstring

* more details

* trigger CI

* Apply suggestions from code review
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* Update src/transformers/modeling_utils.py

* fixup + is_main_process

* added `save_peft_format` in save_pretrained

* up

* fix nits here and there

* nits here and there.

* docs

* revert `encoding="utf-8"`

* comment

* added slow tests before the PEFT release.

* fixup and nits

* let's be on the safe zone

* added more comments

* v1 docs

* add remaining docs

* Apply suggestions from code review
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>

* move to `lib_integrations`

* fixup

* this time fixup

* Apply suggestions from code review
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>

* address final comments

* refactor to use `token`

* add PEFT to DockerFile for slow tests.

* added pipeline support.

---------
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>
Co-authored-by: Sylvain Gugger <35901082+sgugger@users.noreply.github.com>
Co-authored-by: Steven Liu <59462357+stevhliu@users.noreply.github.com>