* Rename gpuType/gpuNumber to skuType/skuNumber
Rename gpuType -> skuType, gpuNumber -> skuNumber.
* Rename gpu to device
Rename gpu to device when referring affinity and index.
* Add explanation for sku type and device
Add explanation for sku type and device.
* Revert term sku and device to leaf cell
Revert term sku and device to leaf cell.
* Fix
Fix.
* Convert old spec annotations for compatibility
Convert old spec annotations for backward compatibility.
* Update README
Update README.
* Resolve comments
Resolve comments.
* Update
Update.
* algorithm refactored
* small refinements; add comments
* solve comments
* minor fix
* minor fixes
* collect preemption victims
* Return FailedNodes to tell k8s preemption may help
* Return FailedNodes to tell k8s preemption may help
* support preemption
* preemption tested & minor bug fixes
* fix algorithm randomness
* compare pods/cells by uid/name
* compare cells in CellEqual
* refactor topologyAwareScheduler
* minor fix
* minor