DeepSpeed
                                
                                
                                
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                        [BUG] Communication dtype is broken in zero 3
https://github.com/microsoft/DeepSpeed/blob/0a73e6e6137a91e1b776f725b637f8b37a75f8e7/deepspeed/runtime/zero/stage3.py#L1168
Only works for float32.
@stas00, FYI