[IPython-dev] [parallel] issue when executing 'import pandas as pd' on engine
Mon Sep 16 14:28:49 CDT 2013
These codes of mine can be few hundred lines and depend upon other 2 or 3
modules that I have put together.
If the problem is where I think it is, I might be able to write a
standalone program (maybe in a notebook). Stay tuned :D
2013/9/16 MinRK <email@example.com>
> Cn you please share your whole code?
> On Mon, Sep 16, 2013 at 9:03 AM, Francesco Montesano <
> firstname.lastname@example.org> wrote:
>> Dear all,
>> I'm having an issue with the parallel (v1.1.0, under python 2.7).
>> Some time ago I did build a number of python codes to manipulate
>> I can have either thousands of small file or few possibly huge file.
>> So I've written my codes such that I can chose from command whether to
>> use any of the two.
>> Typically my codes have the following structure:
>> import numpy as np
>>> import pandas as pd
>>> def parse(...): #argparse
>>> def to_do(fname,...): #function(s) that do what I need
>>> if __name__=='__main__':
>>> args = parse(...)
>>> if args.paralell == False:
>>> for fn in file_name_list:
>>> to_do(fn, ...)
>> else: #execute in parallel
>> parallel_env = Lbv() # custom class that init a load
>>> ballance view
>> imports = ['import numpy as np', 'import pandas as pd']
>> parallel_env.exec_on_engine(imports) # execute the above strings
>>> on all engines (direct view)
>> #execute in parallel
>> runs = [parallel_env.apply(to_do, os.path.abspath(fn), ...) for
>>> fn in file_name_list]
>> I build the whole parallel dispatching against ipython 0.13 and
>> everything worked fine.
>> But today I've tried to run one of my scripts enabling parallel and got
>> the following error
>>> File "code.py", line XXX, in <module>
>>> File "XXX/ipython_parallel.py", line 86, in exec_on_engine
>>> "XXX.local/lib/python2.7/site-packages/IPython/parallel/error.py", line
>>> 199, in raise_exception
>>> raise RemoteError(en, ev, etb, ei)
>>> RemoteError: NameError(name 'plt' is not defined)
>> The only thing that uses matplotlib is pandas, and modifying
>> imports = ['import numpy as np', 'import matplotlib.pyplot as plt',
>>> 'import pandas as pd']
>> seems to solve the problem (although at least in one case the first call
>> of my code crashed with the error and the second went through).
>> If I run my code without requiring the ipy parallel I don't have any
>> problem with 'plt'
>> I guess that this is a bug. But I still haven't understood how to debug
>> what happens on the engines, so I can't give more details.
>> Any clues?
>> If needed I can load my 'ipython_parallel.py' module in gist/github
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