inline constexpr char kSavedModelFilenamePrefix[] = "saved_model";
// SavedModel proto filename.
inline constexpr char kSavedModelFilenamePb[] = "saved_model.pb";

// SavedModel chunked proto filename.
inline constexpr char kSavedModelFilenameCpb[] = "saved_model.cpb";

// SavedModel text format proto filename.
inline constexpr char kSavedModelFilenamePbTxt[] = "saved_model.pbtxt";

// Subdirectory where debugging related files are written.

bool MaybeSavedModelDirectory(const string& export_dir) {
  const string saved_model_pb_path =
      io::JoinPath(export_dir, kSavedModelFilenamePb);
  const string saved_model_cpb_path =
      io::JoinPath(export_dir, kSavedModelFilenameCpb);
  const string saved_model_pbtxt_path =
      io::JoinPath(export_dir, kSavedModelFilenamePbTxt);
  return Env::Default()->FileExists(saved_model_pb_path).ok() ||