问题描述
我想知道这个错误可能意味着什么:
I am wondering what this error might mean:
PicklingError: Can't pickle <type 'function'>: attribute lookup __builtin__.function failed
我知道这与使用多核有关.我在集群上运行我的程序,并在我的这行代码中使用了 15 个线程:
I understand that it has something to do with using multiple cores. I am running my program on a cluster and using 15 threads in this line of my code:
gauss2 = PTSampler(ntemps, renwalkers, rendim, lnlike, lnprior, threads=15)
有问题的采样器是在 http:///dan.iel.fm/emcee/current/user/pt/
知道这个错误可能意味着什么吗?
Any idea what this error might mean?
推荐答案
这个错误意味着你试图腌制一个内置的 FunctionType……而不是函数本身.这可能是由于某个地方的编码错误导致了函数的类而不是函数本身.
The error means you are trying to pickle a builtin FunctionType… not the function itself. It's likely do to a coding error somewhere picking up the class of the function instead of the function itself.
>>> import sys >>> import pickle >>> import types >>> types.FunctionType <type 'function'> >>> try: ... pickle.dumps(types.FunctionType) ... except: ... print sys.exc_info()[1] ... Can't pickle <type 'function'>: it's not found as __builtin__.function >>> def foo(x): ... return x ... >>> try: ... pickle.dumps(type(foo)) ... except: ... print sys.exc_info()[1] ... Can't pickle <type 'function'>: it's not found as __builtin__.function >>> try: ... pickle.dumps(foo.__class__) ... except: ... print sys.exc_info()[1] ... Can't pickle <type 'function'>: it's not found as __builtin__.function >>> pickle.dumps(foo) 'c__main__ foo p0 .' >>> pickle.dumps(foo, -1) 'x80x02c__main__ foo qx00.'
如果您有一个 FunctionType 对象,那么您需要做的就是获取该类的一个实例——即像 foo 这样的函数.
If you have a FunctionType object, then all you need to do is get one of the instances of that class -- i.e. a function like foo.