Update metric.py，support multi-server training with Ascend 910B#1578
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barondai wants to merge 1 commit intoopen-mmlab:mainfrom
Open
Update metric.py，support multi-server training with Ascend 910B#1578barondai wants to merge 1 commit intoopen-mmlab:mainfrom
barondai wants to merge 1 commit intoopen-mmlab:mainfrom
