[IPython-dev] Confusing NameError in Parallelizing with IPython

Michael Bilow michael.k.bilow@gmail....
Fri Sep 7 16:18:36 CDT 2012


Wow, you nailed it, thanks.  I was running ipcluster start in a different
directory from the one my code was in.  I still don't understand the
provenance of that particular error, but I can see how it could cause one.

Thanks!

Michael

On Fri, Sep 7, 2012 at 2:04 PM, MinRK <benjaminrk@gmail.com> wrote:

>
>
> On Fri, Sep 7, 2012 at 1:48 PM, Michael Bilow <michael.k.bilow@gmail.com>wrote:
>
>> Hi!
>>
>> I'm new to this list and to IPython, and I started using IPython to
>> parallelize some code I'd written (complete code:
>> https://github.com/chuyelchulo/ipython-nameerror, requires numpy and
>> PIL). I've been encountering a confusing NameError that keeps popping up
>> when I try to run this program: The function to be mapped (parallel_run) is
>> imported from a module different from __main__, but the interpreter
>> complains that the functions and modules used by parallel_run are not part
>> of the namespace.
>>
>> I asked about the error here (
>> http://stackoverflow.com/questions/12304847/ipython-parallel-computing-namespace-issues),
>> and was told to come to this list.
>>
>
> Hi again!
>
> When I do the following:
>
> $> cd /path/to/ipython-nameerror
> $> ipcluster start -n 4 --daemon
> $> python wrapper_wrapper.py
> Time elapsed:  5.85908985138 s
>
> It seems to work as expected.
>
> A few quick questions:
>
> 1. what is the cwd when you run ipcluster?  Are your engines local or
> remote?  What do you get from:
>
> import os
> import pprint
> from IPython import parallel
>
> client = parallel.Client()
> pprint.pprint(client[:].apply_async(os.getcwdu).get_dict())
>
> or:
>
> %px import wrapper
>
> If I start the engines somewhere else such that `wrapper` is not
> importable, I get the NameErrors you are seeing.
>
> -MinRK
>
>
>> Thanks!
>>
>> Michael
>>
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>>
>
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