I could reproduce the "ZMQError: Address already in use" under Python
3.4, IPython 2.1.0 and scikit-learn master when using cross validation
with n_jobs != 1 in IPython notebook on long running jobs.
There might be a problem with IPython notebook and POSIX forks
triggered by the use of mulitprocessing.
Unfortunately I cannot reproduce when I tried to reproduce it on a toy
debugging script.
The good news is that under Python 3.4, you can stop using raw forks
by adding the following lines at the beginning of your notebook:
import multiprocessing as mp
import sys
if hasattr(mp, 'set_start_method') and not sys.platform.startswith('win'):
mp.set_start_method('forkserver')
--
Olivier
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