scikit-learn's GridSearchCV stops working when n_jobs>1

Question

I have previously asked here come up with following lines of code:

parameters = [{\'weights\': [\'uniform\'], \'n_neighbors\': [5, 10, 20, 30, 40, 50, 60, 70         


        

Answer 1

That worked perfectly for me as well (upgrading was a bit of a drag but this was the only fix, of many attempted, that worked in my case). For any other ipython notebook users out there, the best way to work this in is to add it to the notebook configuration (you'll get an error trying to run it straight in a notebook). The commands can be added like this:

# in ipython_notebook_config.py
c.IPKernelApp.exec_lines = ['import multiprocessing', 'multiprocessing.set_start_method("forkserver")']