message: convert negative index in expend_dims
diff: @@ -1049,6 +1049,10 @@ tf::Status Builder::TranslateGraph(const std::vector<tf::TensorShape>& inputs,
  }
  auto& shape = ng_input->second->get_shape();
  + auto shape_size = shape.size();
  + if (dim_vec[0] < 0) {
  + dim_vec[0] = shape_size + dim_vec[0];
  + }
  auto out_shape = shape;
  out_shape.insert(out_shape.begin() + size_t(dim_vec[0]), 1);
  std::vector<size_t> shape_dimensions(shape.size());
  