Fix Python 3 compatibilities (#6908)
Fix Python 3 compatibilities (#6908)


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