message: Fix over-flow issue when calculate dil tensor elements
  If the input tensor is with large number of elements, the nelemnts api will be over flow
diff: @@ -89,7 +89,7 @@ class tensor : public memory {
  inline dim_t nelems(bool with_padding = false) const {
  if (is_zero()) return 0;
  auto dims = with_padding ? data.padded_dims : data.dims;
  - return std::accumulate(dims, dims + data.ndims, 1,
  + return std::accumulate(dims, dims + data.ndims, (dim_t)1,
  std::multiplies<dim_t>());
  }
  