auto buffer_or =
          BuildBuffer(value, not_returned_by_subgraph, buffer_index);
      if (!buffer_or) return false;
      buffers_.push_back(*buffer_or);
    } else {
      buffers_.push_back(empty_buffer_);
    }

    auto tensor_or =
        BuildTensor(value, tensor_name, buffer_index, quant_parameters);
    if (!tensor_or) return false;
    tensors.push_back(*tensor_or);

    DeclareOpInterfaceMethods<TFL_RuntimeVerification>]> {
  let summary = "External const op.";

  let description = [{
    External const op holds a `buffer_index` which points to a constant
    in the flatbuffer.
  }];

  let arguments = (ins I32Attr:$buffer_index);

  let results = (outs AnyTensor:$output);
}

def TFL_Conv2DOp : TFL_ConvOp<"conv_2d", "Convolution", 0,