Integrate two allreduce fusion set interfaces into one · Pull Request !189 · MindSpore/mindspore

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespaces from that line:
/kind feature

What does this PR do / why do we need it:
Integrate two allreduce fusion set interfaces into one

Which issue(s) this PR fixes:

Special notes for your reviewers:

GVPMindSpore / mindspore