无法pickle功能

Question

所以我试着通过做一点多处理来加速我的计算时间

我想用泳池工人。

在我的代码顶部我有

import Singal as s
import multiprocessing as mp
def wrapper(Channel):
    Noise_Frequincies = []
    for i in range(1,125):
        Noise_Frequincies.append(60.0*float(i))
    Noise_Frequincies.append(180.0)
    filter1 = s.Noise_Reduction(Sample_Rate,Noise_Frequincies,Channel)
    return filter1

到时候我用

Both_Channels = [Chan1, Chan2]
results = mp.Pool(2).map(wrapper,Both_Channels)
filter1 = results[0]
filter2 = results[1]

我得到以下错误

Exception in thread Thread-2:
Traceback (most recent call last):
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 808, in __bootstrap_inner
self.run()
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/threading.py", line 761, in run
self.__target(*self.__args, **self.__kwargs)
  File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/multiprocessing/pool.py", line 342, in _handle_tasks
put(task)
PicklingError: Can't pickle <type 'function'>: attribute lookup __builtin__.function failed

Chan1和Chan2是我的信号阵列，我正试图从每个阵列中滤除一些噪声。 我对多处理还不熟悉，所以如果这是个愚蠢的错误，我很抱歉

Answer 1

我把这个问题标记为that Q/A的dup，总结一下：您不能pickle函数，当您将wrapper()传递给Pool().map()时，您正在尝试这样做。要pickle函数，需要使用copy_reg，如example所示。

" Classes, functions, and methods cannot be pickled -- if you pickle an object, the object's class is not pickled, just a string that identifies what class it belongs to. " (cf doc)

• http://docs.python.org/2/library/copy_reg.html?highlight=copyreg
• http://bytes.com/topic/python/answers/552476-why-cant-you-pickle-instancemethods

I don't use custom classes, and that's where his issue is (at least as far as I can tell)

不，他的问题是他试图pickle一个实例方法，这个方法与函数比较接近，因为两者都不能pickle。解决办法A也应该对你有用。

虽然我没有测试

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