星图结合tqdm? [英] Starmap combined with tqdm?

问题描述

我正在做一些并行处理，如下:

I am doing some parallel processing, as follows:

with mp.Pool(8) as tmpPool:
        results = tmpPool.starmap(my_function, inputs)

其中输入看起来像: [(1,0.2312)，(5,0.52)...] 即int和float的元组.

where inputs look like: [(1,0.2312),(5,0.52) ...] i.e., tuples of an int and a float.

代码运行良好，但是我似乎无法将其包裹在加载栏(tqdm)上，例如可以通过以下imap方法来完成:

The code runs nicely, yet I cannot seem to wrap it around a loading bar (tqdm), such as can be done with e.g., imap method as follows:

tqdm.tqdm(mp.imap(some_function,some_inputs))

也可以对星图进行此操作吗?

Can this be done for starmap also?

谢谢！

推荐答案

使用starmap()是不可能的，但是使用添加Pool.istarmap()的补丁程序是可能的.它基于imap()的代码.您要做的就是创建istarmap.py文件并导入模块以应用补丁，然后再进行常规的多处理导入.

It's not possible with starmap(), but it's possible with a patch adding Pool.istarmap(). It's based on the code for imap(). All you have to do, is create the istarmap.py-file and import the module to apply the patch before you make your regular multiprocessing-imports.

# istarmap.py
import multiprocessing.pool as mpp


def istarmap(self, func, iterable, chunksize=1):
    """starmap-version of imap
    """
    if self._state != mpp.RUN:
        raise ValueError("Pool not running")

    if chunksize < 1:
        raise ValueError(
            "Chunksize must be 1+, not {0:n}".format(
                chunksize))

    task_batches = mpp.Pool._get_tasks(func, iterable, chunksize)
    result = mpp.IMapIterator(self._cache)
    self._taskqueue.put(
        (
            self._guarded_task_generation(result._job,
                                          mpp.starmapstar,
                                          task_batches),
            result._set_length
        ))
    return (item for chunk in result for item in chunk)


mpp.Pool.istarmap = istarmap

然后在您的脚本中:

import istarmap  # import to apply patch
from multiprocessing import Pool
import tqdm    


def foo(a, b):
    for _ in range(int(50e6)):
        pass
    return a, b    


if __name__ == '__main__':

    with Pool(4) as pool:
        iterable = [(i, 'x') for i in range(10)]
        for _ in tqdm.tqdm(pool.istarmap(foo, iterable),
                           total=len(iterable)):
            pass

这篇关于星图结合tqdm?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！