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Allow DeepSpeed models to be initialized with optimizer=None
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>

Co-authored-by: Samyam Rajbhandari <samyamr@microsoft.com>

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

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

* [doc] xref to hostfile discussion

wasn't clear where to find what was meant by `hostfile` - so adding a link to where it's discussed.

* remove whitespace

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

* Update launch.py

* formatting

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

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

* fix arch flags, add PTX

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

* Switch from deprecated allreduce interface.

* Make pipeline checkpoint files portable.

RTX-30 series are compute_86
```
python -c "import torch; print(torch.cuda.get_device_capability())"
```
This PR adds support for this compute capability.

Reference: https://developer.nvidia.com/cuda-gpus

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

* 1) Register layout as buffer of module so that we can save/load checkpoint; 2) Add a broadcast of layout at the beginning to ensure different processes will have consistent layout during distributed training.

* Add docstring for max_seq_length argument in SparseSelfAttention
Co-authored-by: Zhun Liu <zhunliu@microsoft.com>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

* [cifar tutorial] improve readability 

* tracking optimizer step in cpu-adam when loading checkpoint

* add warning/error message for updating optimizer step count

* resolve build issue

* supporting state update from the python side

* track step from python in all cases

* remove comma

* supporting different hidden dimensions

* add support for larger hidden dimensions (greater than 8K)

* remove empty line

* add loop unrolling factor for dropout kernels

* update different kernels based on the reviews
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>

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>