Improve progress bar doc and log the bar instead of stdout (#6409)
Improve progress bar doc and log the bar instead of stdout (#6409)


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