fix more py3 compatibility...
fix more py3 compatibility...

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