simplify mnist mlp example
simplify mnist mlp example

yajiedesign/mxnet,yajiedesign/mxnet,zhreshold/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,mbaijal/incubator-mxnet,ptrendx/mxnet,tlby/mxnet,mbaijal/incubator-mxnet,reminisce/mxnet,reminisce/mxnet,yajiedesign/mxnet,szha/mxnet,reminisce/mxnet,zhreshold/mxnet,yajiedesign/mxnet,larroy/mxnet,yajiedesign/mxnet,sxjscience/mxnet,szha/mxnet,DickJC123/mxnet,leezu/mxnet,mbaijal/incubator-mxnet,reminisce/mxnet,eric-haibin-lin/mxnet,DickJC123/mxnet,larroy/mxnet,szha/mxnet,larroy/mxnet,reminisce/mxnet,szha/mxnet,eric-haibin-lin/mxnet,apache/incubator-mxnet,ForkedReposBak/mxnet,reminisce/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,szha/mxnet,JuliaPackageMirrors/MXNet.jl,sxjscience/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,larroy/mxnet,yajiedesign/mxnet,tlby/mxnet,leezu/mxnet,apache/incubator-mxnet,mbaijal/incubator-mxnet,eric-haibin-lin/mxnet,leezu/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,mbaijal/incubator-mxnet,tlby/mxnet,zhreshold/mxnet,mbaijal/incubator-mxnet,ptrendx/mxnet,leezu/mxnet,ptrendx/mxnet,eric-haibin-lin/mxnet,dmlc/mxnet,szha/mxnet,ptrendx/mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,dmlc/mxnet,leezu/mxnet,ForkedReposBak/mxnet,larroy/mxnet,larroy/mxnet,sxjscience/mxnet,sxjscience/mxnet,tlby/mxnet,larroy/mxnet,DickJC123/mxnet,eric-haibin-lin/mxnet,ptrendx/mxnet,DickJC123/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,mbaijal/incubator-mxnet,leezu/mxnet,ForkedReposBak/mxnet,ptrendx/mxnet,sxjscience/mxnet,larroy/mxnet,zhreshold/mxnet,szha/mxnet,dmlc/mxnet,zhreshold/mxnet,dmlc/mxnet,reminisce/mxnet,ptrendx/mxnet,szha/mxnet,zhreshold/mxnet,reminisce/mxnet,dmlc/mxnet,tlby/mxnet,reminisce/mxnet,larroy/mxnet,tlby/mxnet,ptrendx/mxnet,leezu/mxnet,BigEpsilon/MXNet.jl,sxjscience/mxnet,apache/incubator-mxnet,yajiedesign/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,tlby/mxnet,szha/mxnet,leezu/mxnet,ForkedReposBak/mxnet,dmlc/mxnet,yajiedesign/mxnet,zhreshold/mxnet,reminisce/mxnet,dmlc/mxnet,dmlc/mxnet,ptrendx/mxnet,apache/incubator-mxnet,eric-haibin-lin/mxnet,yajiedesign/mxnet,tlby/mxnet,ptrendx/mxnet,dmlc/mxnet,mbaijal/incubator-mxnet,tlby/mxnet