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Enabled via `stage=0` which corresponds to DDP. Remove hardwired path to b16_optimizer. Enable`torch.autocast` for DDP training Enable native mixed precision DDP for bfloat16 Update torch.autocast and native mixed precision UTs <img width="976" height="184" alt="image" src="https://github.com/user-attachments/assets/92904cdc-e312-46a4-943f-011eb5ab146a" /> --------- Signed-off-by: Olatunji Ruwase <tunji.ruwase@snowflake.com> Co-authored-by: Stas Bekman <stas00@users.noreply.github.com>