[Fix]use a more intuitive way to limit the #ops in a group (#4018)
[Fix]use a more intuitive way to limit the #ops in a group (#4018)

* use a more intuitive way to limit the #ops in a group

* format

sxjscience/tvm,Laurawly/tvm-1,tqchen/tvm,dmlc/tvm,sxjscience/tvm,dmlc/tvm,sxjscience/tvm,tqchen/tvm,Laurawly/tvm-1,sxjscience/tvm,Laurawly/tvm-1,Laurawly/tvm-1,sxjscience/tvm,dmlc/tvm,tqchen/tvm,tqchen/tvm,dmlc/tvm,tqchen/tvm,Laurawly/tvm-1,sxjscience/tvm,Laurawly/tvm-1,sxjscience/tvm,Laurawly/tvm-1,tqchen/tvm,dmlc/tvm,tqchen/tvm,tqchen/tvm,dmlc/tvm,dmlc/tvm,dmlc/tvm,tqchen/tvm,sxjscience/tvm,dmlc/tvm,Laurawly/tvm-1,Laurawly/tvm-1,tqchen/tvm,sxjscience/tvm,Laurawly/tvm-1