// can change and thus affect which kernel is picked.
  auto x = FingerprintCat64(cache_key.high64, cache_key.low64);
  std::string fname =
      absl::StrCat("_expanded_", ndef.name(), "_", std::to_string(x));
  if (!ctx.FindFunctionByName(fname)) {
    TF_ASSIGN_OR_RETURN(auto func, ExpandNode(ndef, fname));
    TF_RETURN_IF_ERROR(ctx.AddFunctionDef(func));
  }

  // Rewrite the out_op to be the call op. This essentially a deep copy of the