Function serial

tfjs-data/src/iterators/lazy_iterator.ts:474–476

* Force an iterator to execute serially: each next() call will await the * prior one, so that they cannot execute concurrently.

()

   * prior one, so that they cannot execute concurrently.
   */
  serial(): LazyIterator<T> {
    return new SerialIterator(this);
  }
}

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