ze chunksize and submitted to the process pool.
        If set to one, the items in the list will be sent one at a time.

Returns:
    An iterator equivalent to: map(func, *iterables) but the calls may
    be evaluated out-of-order.

Raises:
    TimeoutError: If the entire result iterator could not be generated
        before the given timeout.
    Exception: If fn(*args) raises for any values.
r'