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我是一位尝试使用python进行科学编程的新手程序员。我认为这些帖子(How to work with interactively-defined classes in IPython.parallel?和ipython parallel push custom object)涉及到类似的问题,但对我无用。我想运行我的代码作为脚本(PBS或SGE排队调度程序),我不知道如何使用莳萝。将IPython并行群集对象传递到批处理执行的自定义类中
本质上,我试图使用Ipython并行群集来分割自定义类方法中定义的计算。
我想将一个集群对象传递到我的自定义类实例中,然后使用该集群拆分对作为成员定义的数据进行操作的计算。
- 已经开始使用
ipcluster
(/path/to/ipcontroller-client.json
) - 然后,我想运行
python test_parallel.py
- 凡集群,
test_parallel.py
是
class Foo(object):
def __init__(self):
from numpy import arange
self.data = arange(10)*10
def A(self, y):
print "in A:", y
self.data[y]
def parallelA(self, z, cl):
print "in parallelA:", cl[:].map_sync(self.A, z)
def serialA(self, z):
print "in serialA:", map(self.A, z)
if __name__ == "__main__":
from IPython.parallel import Client
f = '/path/to/security/ipcontroller-client.json'
c = Client(f)
asdf = Foo()
asdf.serialA([1, 3, 5]) ## works
asdf.parallelA([1, 3, 5], c) ## doesn't work
的outpu t是
$ ~/Projects/parcellation$ python test_parallel.py
in serialA: in A: 1
in A: 3
in A: 5
[None, None, None]
in parallelA:
Traceback (most recent call last):
File "test_parallel.py", line 24, in <module>
asdf.parallelA([1, 3, 5], c) ## doesn't work
File "test_parallel.py", line 11, in parallelA
print "in parallelA:", cl[:].map_sync(self.A, z)
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/view.py", line 366, in map_sync
return self.map(f,*sequences,**kwargs)
File "<string>", line 2, in map
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/view.py", line 66, in sync_results
ret = f(self, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/view.py", line 624, in map
return pf.map(*sequences)
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/remotefunction.py", line 271, in map
ret = self(*sequences)
File "<string>", line 2, in __call__
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/remotefunction.py", line 78, in sync_view_results
return f(self, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/remotefunction.py", line 243, in __call__
ar = view.apply(f, *args)
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/view.py", line 233, in apply
return self._really_apply(f, args, kwargs)
File "<string>", line 2, in _really_apply
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/view.py", line 66, in sync_results
ret = f(self, *args, **kwargs)
File "<string>", line 2, in _really_apply
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/view.py", line 51, in save_ids
ret = f(self, *args, **kwargs)
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/view.py", line 567, in _really_apply
ident=ident)
File "/usr/local/lib/python2.7/dist-packages/IPython/parallel/client/client.py", line 1263, in send_apply_request
item_threshold=self.session.item_threshold,
File "/usr/local/lib/python2.7/dist-packages/IPython/kernel/zmq/serialize.py", line 145, in pack_apply_message
arg_bufs = flatten(serialize_object(arg, buffer_threshold, item_threshold) for arg in args)
File "/usr/local/lib/python2.7/dist-packages/IPython/utils/data.py", line 30, in flatten
return [x for subseq in seq for x in subseq]
File "/usr/local/lib/python2.7/dist-packages/IPython/kernel/zmq/serialize.py", line 145, in <genexpr>
arg_bufs = flatten(serialize_object(arg, buffer_threshold, item_threshold) for arg in args)
File "/usr/local/lib/python2.7/dist-packages/IPython/kernel/zmq/serialize.py", line 89, in serialize_object
buffers.insert(0, pickle.dumps(cobj, PICKLE_PROTOCOL))
cPickle.PicklingError: Can't pickle <type 'instancemethod'>: attribute lookup __builtin__.instancemethod failed
理解为什么这不起作用任何帮助,并修复,需要最少的代码改变将是非常有益的。
谢谢!