void Cancel() override {}

 private:
  ThreadPool tpool_;
};
}  // namespace

RuntimeFallbackExecutor::RuntimeFallbackExecutor(int64_t num_threads)
    : intra_op_(std::make_unique<IntraOpThreadPool>(num_threads)) {
  // Create a HostContext for running TFRT functions. Concurrent work queue acts
  // similar to the Tensorflow `inter-op` thread pool, so we'll match the size.