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This PR:
* fixes a misspelled method name
* also `( () )` doesn't read too well, until one reads the code and understands that it's not a formatting bug. I proposed to simply say that it's a callable object.

Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

In the absence of a model parallel group, model_parallel_allreduce should not do any reduction. This commit fixes the bug which was doing a model parallel allreduce across world group when model parallel group is None

* Use zero-tensors for missing gradients to avoid size mismatch

* Unit test for unbalanced gradients in ZeRO

* Formatting fixes

* Use AML method to set env vars instead of using mpi4py.
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* Add guard to not using `torch.version.cuda` above no-CUDA environment.
* Fix several typos on setup.py.
Signed-off-by: Seunghwan Hong <seunghwan@scatterlab.co.kr>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* zero-1 memory fix

* auto-tune max elems per comm to reduce padding/comm intervals

* clean-up and added previously missing reduction options

* fix testing backing to work with torch1.7

* Fix layout bug in ZeRO Stage 1 checkpoint logic
Add elastic checkpoint option for ZeRO stage 1, default to True

* Format fixes

* remove cpu-feature

* remove psutils requirement

* Adds torch install requirement to documentation.

* build ops documentation

* on cpu box error gracefully if cuda home doesn't exist

* gaurd against torch import issue

* fix sytax error

* fix import

Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: Reza Yazdani <reyazda@microsoft.com>

* Update zero.md

Update to ZeRO tutorial to specify the use of activation checkpointing

* Update zero-offload.md

Use activation checkpointing with ZeRO-Offload
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* Progressive layer dropping docs (#499)

* test

* Adding tutorial and news page for pld

* updating the tutorial and posts of PLD

* update the finetune tutorial

* Update PLD tutorial (#512)

* Update installation instructions

* Format fix

* ZeRO tutorial

* Format fixes

* ZeRO-Offload

* ZeRO and ZeRO-Offload tutorials

* Update navigation page

* Format fixes

* Add yuxhe feedback

* Fix blog post link

* Fix OneBit-Adam link
Tweak scheduler example

* Fix date link

* Add DeepSpeed_Adam

* Add PLD tutorial to navigation
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* updating the pld docs

* DeepSpeed implementation of PLD (#508)

* DeepSpeed implementation of PLD

* Format fixes

* Formatting fixes

* Fix broken url

* Address PR feedback

* Bump DSE
Co-authored-by: Minjia Zhang <33713995+minjiaz@users.noreply.github.com>
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>
Co-authored-by: Minjia Zhang <minjiaz@microsoft.com>

* PLD documentation

* Formatting fixes

* Fix url bug

* PLD documentation

* Formatting fixes

* fixing cpu-adam

* fixing copy with optimizer for data and model parallelism

* fixing cpu-adam

* fix cpu-adam

* fix cpu-adam

* add adamW to CPU-ADAM implementation

* supporting cpu-adam optimizer for zero-offload on deepspeed side

* bump DSE to match cpu-adam updates
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>