fix the rest of pylint warning
fix the rest of pylint warning

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