example/svm_mnist: use module instead of model (#6738)
example/svm_mnist: use module instead of model (#6738)

Current example/svm_mnist is based on model, a deprecated API that
causes a warning like this:
```
svm_mnist.py:71: DeprecationWarning: mxnet.model.FeedForward has been
deprecated. Please use mxnet.mod.Module instead.
```

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