/// won't be registered anymore is if this function gets called by core
  /// TensorFlow and the `TF_Filesystem*` object is destroyed. However, due to
  /// registration being done in a static instance of `Env`, the destructor of
  /// `FileSystem` is never called (see
  /// https://github.com/tensorflow/tensorflow/issues/27535). In turn, this
  /// function will never be called. There are plans to refactor registration
  /// and fix this.

  tensorflow::Status error_status;
  {
    // Start a threadpool to convert signatures, since signature conversion can
    // be time consuming especially for large models. Threadpool destructor
    // blocks until all work is done.
    thread::ThreadPool thread_pool(Env::Default(), "ConvertSignatures",
                                   kNumThreadToConvertSignatures);