[rcnn] remove a redundant check and an argument in test_rcnn (#3641)
[rcnn] remove a redundant check and an argument in test_rcnn (#3641)


ptrendx/mxnet,kevinthesun/mxnet,EvanzzzZ/mxnet,zhreshold/mxnet,indhub/mxnet,arikpoz/mxnet,ForkedReposBak/mxnet,weleen/mxnet,danithaca/mxnet,nicklhy/mxnet,madjam/mxnet,jermainewang/mxnet,crazy-cat/incubator-mxnet,jennyzhang0215/incubator-mxnet,wangyum/mxnet,arank/mxnet,TuSimple/mxnet,yuruofeifei/mxnet,jiajiechen/mxnet,thirdwing/mxnet,TuSimple/mxnet,szha/mxnet,ZihengJiang/mxnet,TuSimple/mxnet,Northrend/mxnet,nicklhy/mxnet,EvanzzzZ/mxnet,hesseltuinhof/mxnet,smolix/incubator-mxnet,reminisce/mxnet,yuruofeifei/mxnet,arank/mxnet,larroy/mxnet,smolix/incubator-mxnet,fullfanta/mxnet,wangyum/mxnet,smolix/incubator-mxnet,arank/mxnet,leezu/mxnet,TuSimple/mxnet,stefanhenneking/mxnet,rahul003/mxnet,indhub/mxnet,jennyzhang0215/incubator-mxnet,wangyum/mxnet,DR08/mxnet,yajiedesign/mxnet,zhreshold/mxnet,reminisce/mxnet,kevinthesun/mxnet,vikingMei/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,Mega-DatA-Lab/mxnet,piiswrong/mxnet,gautamkmr/incubator-mxnet,fullfanta/mxnet,Ldpe2G/mxnet,likelyzhao/mxnet,jiajiechen/mxnet,Ldpe2G/mxnet,ShownX/incubator-mxnet,larroy/mxnet,navrasio/mxnet,weleen/mxnet,Mega-DatA-Lab/mxnet,reminisce/mxnet,tlby/mxnet,crazy-cat/incubator-mxnet,piiswrong/mxnet,apaleyes/mxnet,Northrend/mxnet,formath/mxnet,zhreshold/mxnet,lxn2/mxnet,indhub/mxnet,EvanzzzZ/mxnet,kkk669/mxnet,sergeykolychev/mxnet,gautamkmr/incubator-mxnet,likelyzhao/mxnet,arikpoz/mxnet,hesseltuinhof/mxnet,arikpoz/mxnet,coder-james/mxnet,mbaijal/incubator-mxnet,ForkedReposBak/mxnet,arikpoz/mxnet,saurabh3949/mxnet,dmlc/mxnet,apache/incubator-mxnet,LinkHS/incubator-mxnet,navrasio/mxnet,rishita/mxnet,ZihengJiang/mxnet,sergeykolychev/mxnet,CodingCat/mxnet,solin319/incubator-mxnet,xcgoner/dist-mxnet,formath/mxnet,Prasad9/incubator-mxnet,crazy-cat/incubator-mxnet,Mega-DatA-Lab/mxnet,dmlc/mxnet,arank/mxnet,apaleyes/mxnet,Ldpe2G/mxnet,madjam/mxnet,LinkHS/incubator-mxnet,Northrend/mxnet,nicklhy/mxnet,nicklhy/mxnet,rishita/mxnet,DR08/mxnet,thirdwing/mxnet,leezu/mxnet,rishita/mxnet,ykim362/mxnet,indhub/mxnet,madjam/mxnet,kevinthesun/mxnet,gautamkmr/incubator-mxnet,ykim362/mxnet,luoyetx/mxnet,saurabh3949/mxnet,ForkedReposBak/mxnet,ZihengJiang/mxnet,sergeykolychev/mxnet,crazy-cat/incubator-mxnet,likelyzhao/mxnet,ShownX/incubator-mxnet,jennyzhang0215/incubator-mxnet,sxjscience/mxnet,saurabh3949/mxnet,ptrendx/mxnet,rahul003/mxnet,kevinthesun/mxnet,tornadomeet/mxnet,coder-james/mxnet,jermainewang/mxnet,tornadomeet/mxnet,vikingMei/mxnet,eric-haibin-lin/mxnet,kkk669/mxnet,Guneet-Dhillon/mxnet,ShownX/incubator-mxnet,lxn2/mxnet,dmlc/mxnet,apaleyes/mxnet,kkk669/mxnet,jamesliu/mxnet,antoan2/incubator-mxnet,kkk669/mxnet,CodingCat/mxnet,indhub/mxnet,szha/mxnet,wangyum/mxnet,ptrendx/mxnet,kevinthesun/mxnet,navrasio/mxnet,ykim362/mxnet,kkk669/mxnet,leezu/mxnet,ptrendx/mxnet,tornadomeet/mxnet,jamesliu/mxnet,danithaca/mxnet,luoyetx/mxnet,LinkHS/incubator-mxnet,kkk669/mxnet,hpi-xnor/BMXNet,zhreshold/mxnet,jennyzhang0215/incubator-mxnet,reminisce/mxnet,hesseltuinhof/mxnet,EvanzzzZ/mxnet,apaleyes/mxnet,pluskid/mxnet,Northrend/mxnet,ShownX/incubator-mxnet,dmlc/mxnet,DR08/mxnet,DR08/mxnet,wangyum/mxnet,weleen/mxnet,nicklhy/mxnet,solin319/incubator-mxnet,tlby/mxnet,apache/incubator-mxnet,hesseltuinhof/mxnet,jiajiechen/mxnet,danithaca/mxnet,precedenceguo/mxnet,gautamkmr/incubator-mxnet,crazy-cat/incubator-mxnet,stefanhenneking/mxnet,gautamkmr/incubator-mxnet,stefanhenneking/mxnet,rishita/mxnet,navrasio/mxnet,DR08/mxnet,weleen/mxnet,ZihengJiang/mxnet,DR08/mxnet,leezu/mxnet,ShownX/incubator-mxnet,CodingCat/mxnet,arikpoz/mxnet,rishita/mxnet,lxn2/mxnet,CodingCat/mxnet,coder-james/mxnet,Ldpe2G/mxnet,saurabh3949/mxnet,ForkedReposBak/mxnet,apaleyes/mxnet,formath/mxnet,coder-james/mxnet,hotpxl/mxnet,Mega-DatA-Lab/mxnet,yuruofeifei/mxnet,EvanzzzZ/mxnet,fullfanta/mxnet,mbaijal/incubator-mxnet,dmlc/mxnet,gautamkmr/incubator-mxnet,ZihengJiang/mxnet,jiajiechen/mxnet,precedenceguo/mxnet,ZihengJiang/mxnet,reminisce/mxnet,ShownX/incubator-mxnet,jennyzhang0215/incubator-mxnet,sergeykolychev/mxnet,sergeykolychev/mxnet,nicklhy/mxnet,larroy/mxnet,sergeykolychev/mxnet,solin319/incubator-mxnet,antoan2/incubator-mxnet,rishita/mxnet,ykim362/mxnet,danithaca/mxnet,reminisce/mxnet,jiajiechen/mxnet,yajiedesign/mxnet,jennyzhang0215/incubator-mxnet,precedenceguo/mxnet,apaleyes/mxnet,reminisce/mxnet,vikingMei/mxnet,rahul003/mxnet,jermainewang/mxnet,madjam/mxnet,ptrendx/mxnet,DickJC123/mxnet,yajiedesign/mxnet,Prasad9/incubator-mxnet,xcgoner/dist-mxnet,antoan2/incubator-mxnet,LinkHS/incubator-mxnet,fullfanta/mxnet,solin319/incubator-mxnet,rahul003/mxnet,ykim362/mxnet,Northrend/mxnet,CodingCat/mxnet,zhreshold/mxnet,danithaca/mxnet,ZihengJiang/mxnet,likelyzhao/mxnet,ShownX/incubator-mxnet,solin319/incubator-mxnet,Guneet-Dhillon/mxnet,wangyum/mxnet,Guneet-Dhillon/mxnet,arikpoz/mxnet,hpi-xnor/BMXNet,Northrend/mxnet,yajiedesign/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,dmlc/mxnet,pluskid/mxnet,Guneet-Dhillon/mxnet,tornadomeet/mxnet,mbaijal/incubator-mxnet,Prasad9/incubator-mxnet,nicklhy/mxnet,danithaca/mxnet,piiswrong/mxnet,tlby/mxnet,lxn2/mxnet,coder-james/mxnet,navrasio/mxnet,kkk669/mxnet,luoyetx/mxnet,TuSimple/mxnet,DickJC123/mxnet,antoan2/incubator-mxnet,piiswrong/mxnet,luoyetx/mxnet,ZihengJiang/mxnet,ForkedReposBak/mxnet,Northrend/mxnet,apaleyes/mxnet,weleen/mxnet,indhub/mxnet,formath/mxnet,crazy-cat/incubator-mxnet,DR08/mxnet,lxn2/mxnet,jermainewang/mxnet,Mega-DatA-Lab/mxnet,szha/mxnet,szha/mxnet,larroy/mxnet,hpi-xnor/BMXNet,sxjscience/mxnet,larroy/mxnet,ptrendx/mxnet,coder-james/mxnet,formath/mxnet,leezu/mxnet,antoan2/incubator-mxnet,stefanhenneking/mxnet,jennyzhang0215/incubator-mxnet,larroy/mxnet,stefanhenneking/mxnet,szha/mxnet,tornadomeet/mxnet,indhub/mxnet,jiajiechen/mxnet,tornadomeet/mxnet,TuSimple/mxnet,danithaca/mxnet,xcgoner/dist-mxnet,arikpoz/mxnet,kevinthesun/mxnet,coder-james/mxnet,Guneet-Dhillon/mxnet,gautamkmr/incubator-mxnet,EvanzzzZ/mxnet,weleen/mxnet,szha/mxnet,piiswrong/mxnet,fullfanta/mxnet,likelyzhao/mxnet,precedenceguo/mxnet,antoan2/incubator-mxnet,dmlc/mxnet,likelyzhao/mxnet,yuruofeifei/mxnet,pluskid/mxnet,sxjscience/mxnet,hpi-xnor/BMXNet,jiajiechen/mxnet,sxjscience/mxnet,tlby/mxnet,rishita/mxnet,yajiedesign/mxnet,apaleyes/mxnet,apache/incubator-mxnet,vikingMei/mxnet,piiswrong/mxnet,formath/mxnet,wangyum/mxnet,saurabh3949/mxnet,solin319/incubator-mxnet,arikpoz/mxnet,jermainewang/mxnet,solin319/incubator-mxnet,eric-haibin-lin/mxnet,ptrendx/mxnet,stefanhenneking/mxnet,antoan2/incubator-mxnet,lxn2/mxnet,yuruofeifei/mxnet,Guneet-Dhillon/mxnet,thirdwing/mxnet,navrasio/mxnet,madjam/mxnet,ForkedReposBak/mxnet,saurabh3949/mxnet,leezu/mxnet,tlby/mxnet,saurabh3949/mxnet,szha/mxnet,Guneet-Dhillon/mxnet,CodingCat/mxnet,Mega-DatA-Lab/mxnet,wangyum/mxnet,ykim362/mxnet,sergeykolychev/mxnet,thirdwing/mxnet,likelyzhao/mxnet,DR08/mxnet,saurabh3949/mxnet,mbaijal/incubator-mxnet,saurabh3949/mxnet,piiswrong/mxnet,zhreshold/mxnet,DickJC123/mxnet,yajiedesign/mxnet,hotpxl/mxnet,luoyetx/mxnet,crazy-cat/incubator-mxnet,LinkHS/incubator-mxnet,jamesliu/mxnet,yuruofeifei/mxnet,thirdwing/mxnet,xcgoner/dist-mxnet,ForkedReposBak/mxnet,navrasio/mxnet,madjam/mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,fullfanta/mxnet,kevinthesun/mxnet,luoyetx/mxnet,precedenceguo/mxnet,smolix/incubator-mxnet,EvanzzzZ/mxnet,lxn2/mxnet,tlby/mxnet,kevinthesun/mxnet,nicklhy/mxnet,EvanzzzZ/mxnet,jermainewang/mxnet,tlby/mxnet,thirdwing/mxnet,Prasad9/incubator-mxnet,formath/mxnet,piiswrong/mxnet,Northrend/mxnet,CodingCat/mxnet,hesseltuinhof/mxnet,rahul003/mxnet,lxn2/mxnet,sxjscience/mxnet,pluskid/mxnet,ZihengJiang/mxnet,pluskid/mxnet,arikpoz/mxnet,madjam/mxnet,likelyzhao/mxnet,luoyetx/mxnet,Prasad9/incubator-mxnet,precedenceguo/mxnet,weleen/mxnet,jiajiechen/mxnet,CodingCat/mxnet,CodingCat/mxnet,fullfanta/mxnet,jamesliu/mxnet,mbaijal/incubator-mxnet,smolix/incubator-mxnet,gautamkmr/incubator-mxnet,piiswrong/mxnet,crazy-cat/incubator-mxnet,yajiedesign/mxnet,hpi-xnor/BMXNet,hotpxl/mxnet,thirdwing/mxnet,sxjscience/mxnet,vikingMei/mxnet,stefanhenneking/mxnet,mbaijal/incubator-mxnet,Prasad9/incubator-mxnet,Mega-DatA-Lab/mxnet,formath/mxnet,nicklhy/mxnet,fullfanta/mxnet,Northrend/mxnet,zhreshold/mxnet,arank/mxnet,Ldpe2G/mxnet,DR08/mxnet,TuSimple/mxnet,yuruofeifei/mxnet,rishita/mxnet,madjam/mxnet,rahul003/mxnet,formath/mxnet,pluskid/mxnet,yuruofeifei/mxnet,solin319/incubator-mxnet,dmlc/mxnet,dmlc/mxnet,fullfanta/mxnet,rahul003/mxnet,pluskid/mxnet,jermainewang/mxnet,xcgoner/dist-mxnet,hpi-xnor/BMXNet,EvanzzzZ/mxnet,zhreshold/mxnet,indhub/mxnet,TuSimple/mxnet,thirdwing/mxnet,Guneet-Dhillon/mxnet,vikingMei/mxnet,eric-haibin-lin/mxnet,luoyetx/mxnet,Ldpe2G/mxnet,arank/mxnet,zhreshold/mxnet,sergeykolychev/mxnet,Prasad9/incubator-mxnet,stefanhenneking/mxnet,sxjscience/mxnet,LinkHS/incubator-mxnet,navrasio/mxnet,tornadomeet/mxnet,hesseltuinhof/mxnet,reminisce/mxnet,precedenceguo/mxnet,vikingMei/mxnet,jermainewang/mxnet,apache/incubator-mxnet,smolix/incubator-mxnet,sxjscience/mxnet,indhub/mxnet,precedenceguo/mxnet,xcgoner/dist-mxnet,larroy/mxnet,jamesliu/mxnet,reminisce/mxnet,vikingMei/mxnet,kkk669/mxnet,kkk669/mxnet,danithaca/mxnet,TuSimple/mxnet,hpi-xnor/BMXNet,hesseltuinhof/mxnet,hesseltuinhof/mxnet,larroy/mxnet,tornadomeet/mxnet,tlby/mxnet,Ldpe2G/mxnet,hpi-xnor/BMXNet,Mega-DatA-Lab/mxnet,hotpxl/mxnet,hotpxl/mxnet,ykim362/mxnet,LinkHS/incubator-mxnet,jamesliu/mxnet,jennyzhang0215/incubator-mxnet,weleen/mxnet,TuSimple/mxnet,hesseltuinhof/mxnet,eric-haibin-lin/mxnet,rahul003/mxnet,rishita/mxnet,pluskid/mxnet,pluskid/mxnet,ShownX/incubator-mxnet,wangyum/mxnet,antoan2/incubator-mxnet,hotpxl/mxnet,antoan2/incubator-mxnet,ForkedReposBak/mxnet,jamesliu/mxnet,weleen/mxnet,ForkedReposBak/mxnet,danithaca/mxnet,smolix/incubator-mxnet,hpi-xnor/BMXNet,lxn2/mxnet,LinkHS/incubator-mxnet,xcgoner/dist-mxnet,szha/mxnet,hotpxl/mxnet,ptrendx/mxnet,rahul003/mxnet,smolix/incubator-mxnet,coder-james/mxnet,kevinthesun/mxnet,yuruofeifei/mxnet,Mega-DatA-Lab/mxnet,jermainewang/mxnet,Prasad9/incubator-mxnet,vikingMei/mxnet,jiajiechen/mxnet,ShownX/incubator-mxnet,Guneet-Dhillon/mxnet,ykim362/mxnet,gautamkmr/incubator-mxnet,jamesliu/mxnet,solin319/incubator-mxnet,mbaijal/incubator-mxnet,ptrendx/mxnet,yajiedesign/mxnet,arank/mxnet,xcgoner/dist-mxnet,Ldpe2G/mxnet,likelyzhao/mxnet,DickJC123/mxnet,navrasio/mxnet,eric-haibin-lin/mxnet,tlby/mxnet,arank/mxnet,madjam/mxnet,apaleyes/mxnet,eric-haibin-lin/mxnet,Prasad9/incubator-mxnet,arank/mxnet,yajiedesign/mxnet,sergeykolychev/mxnet,hotpxl/mxnet,hotpxl/mxnet,stefanhenneking/mxnet,xcgoner/dist-mxnet,crazy-cat/incubator-mxnet,jamesliu/mxnet,Ldpe2G/mxnet,smolix/incubator-mxnet,LinkHS/incubator-mxnet,leezu/mxnet,sxjscience/mxnet,szha/mxnet,ptrendx/mxnet,ykim362/mxnet,mbaijal/incubator-mxnet,larroy/mxnet,eric-haibin-lin/mxnet,precedenceguo/mxnet,jennyzhang0215/incubator-mxnet,luoyetx/mxnet,leezu/mxnet,coder-james/mxnet,tornadomeet/mxnet,thirdwing/mxnet