LinearRegressionOutput doc update (#6327)
LinearRegressionOutput doc update (#6327)

* Explain squared loss

* Remove a single blank line in regression_output

* Update info about forward and backward pass

* Put data arg inside double backtick

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