Fix flakeyness of test_operator.py:test_reduce. (#10891)
Fix flakeyness of test_operator.py:test_reduce. (#10891)


ptrendx/mxnet,dmlc/mxnet,navrasio/mxnet,eric-haibin-lin/mxnet,precedenceguo/mxnet,szha/mxnet,indhub/mxnet,larroy/mxnet,precedenceguo/mxnet,leezu/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,szha/mxnet,yajiedesign/mxnet,mbaijal/incubator-mxnet,eric-haibin-lin/mxnet,szha/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,tlby/mxnet,szha/mxnet,navrasio/mxnet,reminisce/mxnet,tlby/mxnet,larroy/mxnet,szha/mxnet,jamesliu/mxnet,tlby/mxnet,zhreshold/mxnet,indhub/mxnet,dmlc/mxnet,sxjscience/mxnet,reminisce/mxnet,sxjscience/mxnet,DickJC123/mxnet,yajiedesign/mxnet,ptrendx/mxnet,ptrendx/mxnet,reminisce/mxnet,tlby/mxnet,ptrendx/mxnet,dmlc/mxnet,yajiedesign/mxnet,indhub/mxnet,yajiedesign/mxnet,rahul003/mxnet,larroy/mxnet,dmlc/mxnet,dmlc/mxnet,sxjscience/mxnet,navrasio/mxnet,eric-haibin-lin/mxnet,leezu/mxnet,reminisce/mxnet,reminisce/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,DickJC123/mxnet,szha/mxnet,reminisce/mxnet,ptrendx/mxnet,precedenceguo/mxnet,jamesliu/mxnet,sxjscience/mxnet,ptrendx/mxnet,ForkedReposBak/mxnet,ForkedReposBak/mxnet,indhub/mxnet,ptrendx/mxnet,precedenceguo/mxnet,jamesliu/mxnet,yajiedesign/mxnet,tlby/mxnet,szha/mxnet,leezu/mxnet,rahul003/mxnet,dmlc/mxnet,reminisce/mxnet,larroy/mxnet,tlby/mxnet,DickJC123/mxnet,leezu/mxnet,jamesliu/mxnet,DickJC123/mxnet,dmlc/mxnet,precedenceguo/mxnet,ForkedReposBak/mxnet,rahul003/mxnet,zhreshold/mxnet,yajiedesign/mxnet,larroy/mxnet,leezu/mxnet,ForkedReposBak/mxnet,apache/incubator-mxnet,indhub/mxnet,ForkedReposBak/mxnet,mbaijal/incubator-mxnet,yajiedesign/mxnet,reminisce/mxnet,mbaijal/incubator-mxnet,zhreshold/mxnet,rahul003/mxnet,navrasio/mxnet,navrasio/mxnet,ForkedReposBak/mxnet,rahul003/mxnet,jamesliu/mxnet,indhub/mxnet,apache/incubator-mxnet,yajiedesign/mxnet,tlby/mxnet,zhreshold/mxnet,yajiedesign/mxnet,mbaijal/incubator-mxnet,indhub/mxnet,jamesliu/mxnet,leezu/mxnet,sxjscience/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,sxjscience/mxnet,ptrendx/mxnet,larroy/mxnet,jamesliu/mxnet,eric-haibin-lin/mxnet,eric-haibin-lin/mxnet,rahul003/mxnet,sxjscience/mxnet,zhreshold/mxnet,navrasio/mxnet,precedenceguo/mxnet,szha/mxnet,mbaijal/incubator-mxnet,reminisce/mxnet,mbaijal/incubator-mxnet,precedenceguo/mxnet,precedenceguo/mxnet,apache/incubator-mxnet,indhub/mxnet,jamesliu/mxnet,larroy/mxnet,larroy/mxnet,larroy/mxnet,zhreshold/mxnet,jamesliu/mxnet,zhreshold/mxnet,zhreshold/mxnet,ptrendx/mxnet,navrasio/mxnet,navrasio/mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,precedenceguo/mxnet,ptrendx/mxnet,sxjscience/mxnet,navrasio/mxnet,indhub/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,apache/incubator-mxnet,eric-haibin-lin/mxnet,leezu/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,szha/mxnet,reminisce/mxnet,dmlc/mxnet,mbaijal/incubator-mxnet,rahul003/mxnet,leezu/mxnet,tlby/mxnet,rahul003/mxnet,rahul003/mxnet