[optim] Set defaults to foreach, NOT fused (#95241) #95415
Merged
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Rolling back the default change for Adam and rectifying the docs to reflect that AdamW never defaulted to fused.
Since our fused implementations are relatively newer, let's give them a longer bake-in time before flipping the switch for every user.
Pull Request resolved: #95241
Approved by: https://github.com/ngimel