Function parallel_threads

datasets_preprocess/utils/parallel.py:12–70

tqdm but with parallel execution. Will essentially return res = [ function(arg) # default function(*arg) # if star_args is True function(**arg) # if kw_args is True for arg in args] Note: the first elements of args will no

(
    function,
    args,
    workers=0,
    star_args=False,
    kw_args=False,
    front_num=1,
    Pool=ThreadPool,
    **tqdm_kw
)

def parallel_threads(
    function,
    args,
    workers=0,
    star_args=False,
    kw_args=False,
    front_num=1,
    Pool=ThreadPool,
    **tqdm_kw
):
    """tqdm but with parallel execution.

    Will essentially return
      res = [ function(arg) # default
              function(*arg) # if star_args is True
              function(**arg) # if kw_args is True
              for arg in args]

    Note:
        the <front_num> first elements of args will not be parallelized.
        This can be useful for debugging.
    """
    while workers <= 0:
        workers += cpu_count()
    if workers == 1:
        front_num = float("inf")

    # convert into an iterable
    try:
        n_args_parallel = len(args) - front_num
    except TypeError:
        n_args_parallel = None
    args = iter(args)

    # sequential execution first
    front = []
    while len(front) < front_num:
        try:
            a = next(args)
        except StopIteration:
            return front  # end of the iterable
        front.append(
            function(*a) if star_args else function(**a) if kw_args else function(a)
        )

    # then parallel execution
    out = []
    with Pool(workers) as pool:
        # Pass the elements of args into function
        if star_args:
            futures = pool.imap(starcall, [(function, a) for a in args])
        elif kw_args:
            futures = pool.imap(starstarcall, [(function, a) for a in args])
        else:
            futures = pool.imap(function, args)
        # Print out the progress as tasks complete
        for f in tqdm(futures, total=n_args_parallel, **tqdm_kw):
            out.append(f)