Method prefetch

mlx/data/Stream.cpp:115–118

}

Stream Stream::prefetch(int prefetch_size, int num_thread) const {
  return Stream(
      std::make_shared<stream::Prefetch>(self_, prefetch_size, num_thread));
}
Stream Stream::prefetch_if(bool cond, int prefetch_size, int num_thread) const {
  if (cond) {
    return prefetch(prefetch_size, num_thread);