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

* see_memory_usage fixes

* didn't expect pt-1.2

* fix the order of things

* fix the order of things

* [doc] pipeline

As @g-karthik flagged in https://github.com/microsoft/DeepSpeed/pull/659#discussion_r600132598 my previous correction PR had one sentence that said the wrong thing. So this PR attempts to rectify that. 

Thank you!

* tweak

As discussed in https://github.com/microsoft/DeepSpeed/issues/662 this PR modifies the doc:
* explains what to use instead of CUDA_VISIBLE_DEVICES
* puts the `--hostfile` cl arg in the correct place in the invocation script

Fixes: https://github.com/microsoft/DeepSpeed/issues/662

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

Authors: @awan-10 @conglongli @samyam @jeffra

What's new:

NCCL-based implementation which provides better performance and usability compared to the MPI-based implementation.
Add support to momentum masks for those parameters with constant zero gradients during training.
Bug fixes (e.g., #813).

* NCCL-based 1-bit Adam + Code Refactor for Comm. Backends (#594)

* NCCL based 1-bit Implementation + Refactor to add communication backends (#593)

* add nccl 1-bit optim.

* temporary commit to save stuff.

* Use dist collectives instead of mpi routines.

* remove old code for comm.

* Fix bugs. still does not work.

* modify to test the nccl side code path

* Initial gather impl. Works intra-node.

* Updates to comm. phase 2. nccl comm. passed the tests.

* refactor code to introduce nccl/mpi as backends for onebit adam.

* Refactor updates to test/engine.

* Fix compile/runtime errors.

* simplify support for nccl/mpi backends.

* Add missign file

* Add compression backend in constructor. Revert later.

* modify test with some perf counting.

* Implement a true non-blocking gather for nccl side.

* Revert "Add compression backend in constructor. Revert later."

This reverts commit df8c40d3105e9f2542a8aa6619e80d675a09753f.

* improve the 1-bit adam test.

* Refactor comm. and compression backend in 1-bit adam.

* Fix the test.

* Fix runtime errors and typos in nccl backend

* fix mpi backend. modify tests.

* modify nccl perf test.

* fix mpi side errors.

* Add an mpi perf test

* Sync DSE.

* Remove old collectives file.

* Undo a typo.

* Graceful failure for torch versions that don't support nccl pt2pt.

* Revert "Merge branch 'master' into staging-1bit-nccl-v2"

This reverts commit 78400850703b4b2d84f11b73c109f56919e748ea, reversing
changes made to a6dba72aeafad63661dfe566d3accd03d00be78c.

* Revert "Revert "Merge branch 'master' into staging-1bit-nccl-v2""

This reverts commit 6dbdd9858bafef4d340c089fdc0e3ddde3706f47.

* comm optimization + 1-bit lamb

* Saving/debugging commit.

* finalizing 1-bit lamb

* finalizing 1-bit lamb

* add momentum mask and chkpt handling for 1-bit adam

* Cleanup and modify nccl test to be runnable with deepspeed launcher.

* Fix format.

* fix formatting again.

* make test runnable without mpi4py

* Add dist.alltoall and dist.allgather instead of custom functions.

* remove debug prints.

* formatting and renaming

* renaming

* renaming

* add unit test, fix existing tests

* skip unit test when torch < 1.8

* revert 1-bit lamb

* flatten momentum when dimension is more than 1

* add warning message for 1-bit adam under fp32

* improve version check

* add fp32 test

* 1-bit adam doc

* fix file name

* doc fix

* torch 1.8 is released

* doc fix

* fix tests

* update news

* add doc for momentum mask

* fix checkpoing handling, add unit test

* checkpoint handling doc

* doc final cleanup

* bump dates

* update tests

* url change

* doc fix

* fix test

* doc update
Co-authored-by: Ammar Ahmad Awan <ammar.awan@microsoft.com>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

Admin merging for pure-doc PR that does not trigger build.

* add optimizers and schedules to rtd

* update ds website and fix links

* add optimizers and schedules to rtd

* update ds website and fix links

* add flops profiler to rtd

* fix
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>

* Squash stage3 v1 (#146)
Co-authored-by: Samyam <samyamr@microsoft.com>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>
Co-authored-by: Samyam Rajbhandari <samyamr@microsoft.com>
Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: Shaden Smith <ShadenTSmith@gmail.com>
Co-authored-by: eltonzheng <eltonz@microsoft.com>

* Fix correctness bug (#147)

* formatting fix (#150)

* stage3 bugfix (API) update and simplified FP16 Z3 tests (#151)

* fp16 Z3 API update and bugfix

* revert debug change

* ZeRO-3 detach and race condition bugfixes (#149)

* trying out ZeRO-3 race condition fix

* CUDA sync instead of stream

* reduction stream sync

* remove commented code

* Fix optimizer state_dict KeyError (#148)
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* fix for smaller SGS sizes, ensures each grad is backed by unique tensors (#152)

* Simplifying the logic for getting averaged gradients (#153)

* skip for now

* Z3 Docs redux (#154)

* removing some TODOs and commented code (#155)

* New Z3 defaults (#156)
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* formatting

* megatron external params
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>
Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: Shaden Smith <ShadenTSmith@gmail.com>
Co-authored-by: eltonzheng <eltonz@microsoft.com>

* Fix docstring

* Make screenshots clickable for easier viewing

* Navigation menu in alphabetical order; More clicable screenshots

* Rename 1Cycle doc

* Tweak naming

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

* 1-bit adam doc fix

* 1-bit adam doc fix

* 1-bit adam doc fix
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* work on flops profiler tutorial

* update flops profiler tutorial

* add flops profiler tutorial and fix names

* work on flops profiler tutorial

* update flops profiler tutorial

* add flops profiler tutorial and fix names

* fix tailing ws

* fix names

* remove multistep profiling and update docs

* fix cases where functionals and submodules coexist in a parent module, update readme

* fix typo

* always invoke post hook function

* fix module flops sum and update tests

* update tutorial

* Fix docstring

* Make screenshots clickable for easier viewing

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

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

Co-authored-by: Reza Yazdani <reyazda@microsoft.com>
Co-authored-by: Olatunji Ruwase <olruwase@microsoft.com>

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

* [cifar tutorial] improve readability 

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.

* Adds torch install requirement to documentation.

* build ops documentation

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

* gan tutorial

* formatting fix

* adding pointer to repo; adding navigation link
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* url fix

* revert absolute path but keep some actual fix

* add real readme