message: Simpler loop
diff: @@ -162,7 +162,7 @@ class GraphDefBuilderWrapper {
  const std::vector<std::pair<StringPiece, AttrValue>>& attrs,
  Node** output) {
  std::vector<std::pair<size_t, Node*>> enumerated_inputs(inputs.size());
  - for (int i = 0; static_cast<size_t>(i) < inputs.size(); i++) {
  + for (size_t i = 0; i < inputs.size(); i++) {
  enumerated_inputs[i] = std::make_pair(i, inputs[i]);
  }
  return AddDataset(dataset, enumerated_inputs, {}, attrs, output);
  