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When I try to paralellize python code I get an assertion error. Here is the code :

check = Parallel(n_jobs=ncpu)(delayed(removeident)(h) for h in splitframe)

individually, each element (h) in splitframe works well with the function removeident that is removeident(h) yields expected results.

The error message is on the console :

AssertionError: _ _main_ _
Traceback (most recent call last):
   File "<string>"; line 1, in <module>
   File"C:\Python27\lib\multiprocessing\forking.py"; line 380, in main prepare  (preparation_data)
   File"C:\Python27\lib\multiprocessing\forking.py"; line 488, in prepare assert main_name not in sys.modules, main_name

What could the problem be?

Improve this question
5
  • What error? Where's the traceback? Commented May 27, 2015 at 13:37
  • I run the code on ipython (jupiter) on the console I get the following error : Commented May 27, 2015 at 13:52
  • I run the code on ipython (jupiter) and on the console I get the following error that prints out repetivtely: AssertionError : _ main _ Commented May 27, 2015 at 14:03
  • Edit the error into the question. Commented May 27, 2015 at 14:11
  • 1
    See Why is it important to protect the main loop when using joblib.Parallel? Commented May 27, 2015 at 14:13
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