input_shape->size());
      } else {
        TF_ShapeAndTypeListSetUnknownShape(input_shapes, i);
      }
    }
    TF_ShapeAndTypeList* output_shapes;
    TFE_InferShapes(op, input_shapes,
                    input_tensors.empty()
                        ? nullptr
                        : const_cast<TF_Tensor**>(input_tensors.data()),