[FRONTEND][TENSORFLOW] bug fix for tensorflow official slim models. (#2864)
[FRONTEND][TENSORFLOW] bug fix for tensorflow official slim models. (#2864)

* [FRONTEND][TENSORFLOW] bug fix for tensorflow official slim models.

* 	* review comments

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