Add some docs to `eachbatch` (#149)
Add some docs to `eachbatch` (#149)


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