Add round and cosh operator implementation#77

GordonYang1 wants to merge 4 commits intoInfiniTensor:masterInfiniTensor/ntops:masterfrom

GordonYang1:t1-1-19-diag-sort-round-cosh-alpha-dropoutGordonYang1/ntops:t1-1-19-diag-sort-round-cosh-alpha-dropoutCopy head branch name to clipboard