for (int i = 0; i < ninputs; ++i) {
    // TODO(skyewm): prefix names with underscore (requires some plumbing)
    if (!CreateInput(inputs[i], cond_graph,
                     absl::StrCat("cond_input", i).c_str(), &cond_inputs[i],
                     status)) {
      break;
    }
    if (!CreateInput(inputs[i], body_graph,
                     absl::StrCat("body_input", i).c_str(), &body_inputs[i],