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* Fix mis-aligned-grad

When a parameter is not divisible by world size, the partitioned gradients are mis-aligned due to incorrect padding handling. This PR should fix for that.

* Formatting fix

* Adding static_scale test back for Z3, and also changing hidden size to be not divisile by world_size

* also removing alignment from flat fp16 buffers

* Testing for hidden dim alignment

* inference hook fix

* Update stage3.py

* formatting

* [bug-fix] move params to gpu if offload params is turned off
Co-authored-by: Samyam Rajbhandari <samyamr@microsoft.com>
Co-authored-by: Shaden Smith <Shaden.Smith@microsoft.com>
Co-authored-by: Jeff Rasley <jerasley@microsoft.com>