[Feature]: Support empty tensor in MMSyncBN#1205

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ZwwWayne merged 10 commits intoopen-mmlab:masterfrom ZwwWayne:syncbn-empty

Sep 23, 2021

+253-35

Commits on Aug 14, 2021

[Feature]: support empty tensor in MMSyncBN

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refine code

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resolve comments

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clean unnecessary comments

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fix inaccurate statistics when empty tensor

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Commits on Sep 2, 2021

Merge branch 'master' of github.com:open-mmlab/mmcv into syncbn-empty
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Commits on Sep 19, 2021

Commits on Sep 20, 2021

rephrase, ready for merge
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