Function prefetch

tfjs-data/src/iterators/lazy_iterator.ts:452–454

* Prefetch the first `bufferSize` items in this stream. * * Note this prefetches Promises, but makes no guarantees about when those * Promises resolve. * * @param bufferSize: An integer specifying the number of elements to be * prefetched.

(bufferSize: number)

   *   prefetched.
   */
  prefetch(bufferSize: number): LazyIterator<T> {
    return new PrefetchIterator(this, bufferSize);
  }

  // TODO(soergel): deep sharded shuffle, where supported