[BUGFIX] fix shape ndim out-of-bound bug

src/c_api/c_api.cc

@@ -791,7 +791,7 @@ int MXDataIterGetLabel(DataIterHandle handle, NDArrayHandle *out) {
   // temp hack to make label 1D
   // TODO(tianjun) make label 1D when label_width=0
   mxnet::TShape shape = db.data[1].shape();
-  if (shape[1] == 1) {
+  if (shape.ndim() > 1 && shape[1] == 1) {
     *pndarray = db.data[1].Reshape(mshadow::Shape1(shape[0]));
   } else {
     *pndarray = db.data[1];

src/operator/tensor/matrix_op-inl.h

@@ -589,7 +589,7 @@ void SliceCsrImpl(const SliceParam &param, const OpContext& ctx,
   mxnet::TShape begin(N), end(N);
   for (uint32_t i = 0; i < N; ++i) {
     int s = 0;
-    if (param.begin[i]) {
+    if (i < param.begin.ndim() && param.begin[i]) {
       s = *param.begin[i];
       if (s < 0) s += ishape[i];
     }