Enforces NDArray type in get_symbol (#16871)
Enforces NDArray type in get_symbol (#16871)

Signed-off-by: Serge Panev <7d7b527264efe081319120662722568cfdee2b9d@nvidia.com>
eric-haibin-lin/mxnet,leezu/mxnet,szha/mxnet,DickJC123/mxnet,larroy/mxnet,leezu/mxnet,sxjscience/mxnet,szha/mxnet,zhreshold/mxnet,sxjscience/mxnet,leezu/mxnet,larroy/mxnet,sxjscience/mxnet,yajiedesign/mxnet,yajiedesign/mxnet,zhreshold/mxnet,eric-haibin-lin/mxnet,eric-haibin-lin/mxnet,szha/mxnet,zhreshold/mxnet,yajiedesign/mxnet,tlby/mxnet,zhreshold/mxnet,leezu/mxnet,larroy/mxnet,tlby/mxnet,yajiedesign/mxnet,eric-haibin-lin/mxnet,sxjscience/mxnet,yajiedesign/mxnet,zhreshold/mxnet,yajiedesign/mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,tlby/mxnet,leezu/mxnet,apache/incubator-mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,szha/mxnet,tlby/mxnet,DickJC123/mxnet,DickJC123/mxnet,yajiedesign/mxnet,szha/mxnet,larroy/mxnet,leezu/mxnet,leezu/mxnet,tlby/mxnet,larroy/mxnet,sxjscience/mxnet,ForkedReposBak/mxnet,yajiedesign/mxnet,ForkedReposBak/mxnet,apache/incubator-mxnet,sxjscience/mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,apache/incubator-mxnet,tlby/mxnet,larroy/mxnet,larroy/mxnet,tlby/mxnet,leezu/mxnet,tlby/mxnet,DickJC123/mxnet,larroy/mxnet,larroy/mxnet,eric-haibin-lin/mxnet,szha/mxnet,zhreshold/mxnet,ForkedReposBak/mxnet,tlby/mxnet,zhreshold/mxnet,szha/mxnet,ForkedReposBak/mxnet,sxjscience/mxnet,szha/mxnet,eric-haibin-lin/mxnet,zhreshold/mxnet,szha/mxnet,sxjscience/mxnet,tlby/mxnet,eric-haibin-lin/mxnet,apache/incubator-mxnet,ForkedReposBak/mxnet,eric-haibin-lin/mxnet,ForkedReposBak/mxnet,zhreshold/mxnet,leezu/mxnet