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Korijn opened this issue Nov 12, 2015 · 2 comments · Fixed by #8106
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Clarify n_jobs for gridsearch in docs #5797

Korijn opened this issue Nov 12, 2015 · 2 comments · Fixed by #8106
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@Korijn
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Korijn commented Nov 12, 2015

GridSearchCV's parameter n_jobs appears to indicate the amount of jobs that the work should be split up into, but it's actually the amount of jobs that can run in parallel. Looking at the docs for joblib's Parallel class, the explanation is much clearer than the one in sklearn's docs:

n_jobs: int, default: 1 :
The maximum number of concurrently running jobs, such as the number of Python worker processes when backend=”multiprocessing” or the size of the thread-pool when backend=”threading”. If -1 all CPUs are used. If 1 is given, no parallel computing code is used at all, which is useful for debugging. For n_jobs below -1, (n_cpus + 1 + n_jobs) are used. Thus for n_jobs = -2, all CPUs but one are used.

Can that be clarified in the docs?
@GaelVaroquaux
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GaelVaroquaux commented Nov 12, 2015 via email

@Korijn
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Korijn commented Nov 12, 2015

OK, I will!

@amueller amueller added Easy Well-defined and straightforward way to resolve Documentation Need Contributor labels Oct 27, 2016
accraze added a commit to accraze/scikit-learn that referenced this issue Dec 23, 2016
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DOC: updating GridSearchCV's n_jobs parameter
2a7ab7d 
fixes scikit-learn#5797
@accraze accraze mentioned this issue Dec 23, 2016
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accraze added a commit to accraze/scikit-learn that referenced this issue Jan 1, 2017
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DOC: updating GridSearchCV's n_jobs parameter
ec0111c 
fixes scikit-learn#5797
accraze added a commit to accraze/scikit-learn that referenced this issue Jan 1, 2017
@accraze
DOC: updating GridSearchCV's n_jobs parameter
54bf333 
fixes scikit-learn#5797
accraze added a commit to accraze/scikit-learn that referenced this issue Jan 2, 2017
@accraze
DOC: updating GridSearchCV's n_jobs parameter
5131d3c 
fixes scikit-learn#5797
accraze added a commit to accraze/scikit-learn that referenced this issue Jan 4, 2017
@accraze
DOC: updating GridSearchCV's n_jobs parameter
eca4339 
fixes scikit-learn#5797
accraze added a commit to accraze/scikit-learn that referenced this issue Jan 4, 2017
@accraze
DOC: updating GridSearchCV's n_jobs parameter
c2e48e0 
fixes scikit-learn#5797
accraze added a commit to accraze/scikit-learn that referenced this issue Jan 4, 2017
@accraze
DOC: updating GridSearchCV's n_jobs parameter
88c63d5 
fixes scikit-learn#5797
jnothman pushed a commit that referenced this issue Jan 4, 2017
@accraze @jnothman
DOC: updating GridSearchCV's n_jobs parameter (#8106)
c49ced9 
fixes #5797
raghavrv pushed a commit to raghavrv/scikit-learn that referenced this issue Jan 5, 2017
@accraze @raghavrv
DOC: updating GridSearchCV's n_jobs parameter (scikit-learn#8106)
acfc4a6 
fixes scikit-learn#5797
sergeyf pushed a commit to sergeyf/scikit-learn that referenced this issue Feb 28, 2017
@accraze @sergeyf
DOC: updating GridSearchCV's n_jobs parameter (scikit-learn#8106)
92b9892 
fixes scikit-learn#5797
@Przemo10 Przemo10 mentioned this issue Mar 17, 2017
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Sundrique pushed a commit to Sundrique/scikit-learn that referenced this issue Jun 14, 2017
@accraze @Sundrique
DOC: updating GridSearchCV's n_jobs parameter (scikit-learn#8106)
53c3f8d 
fixes scikit-learn#5797
NelleV pushed a commit to NelleV/scikit-learn that referenced this issue Aug 11, 2017
@accraze @NelleV
DOC: updating GridSearchCV's n_jobs parameter (scikit-learn#8106)
bf2df4d 
fixes scikit-learn#5797
paulha pushed a commit to paulha/scikit-learn that referenced this issue Aug 19, 2017
@accraze @paulha
DOC: updating GridSearchCV's n_jobs parameter (scikit-learn#8106)
ecc9337 
fixes scikit-learn#5797
maskani-moh pushed a commit to maskani-moh/scikit-learn that referenced this issue Nov 15, 2017
@accraze @maskani-moh
DOC: updating GridSearchCV's n_jobs parameter (scikit-learn#8106)
f569dd6 
fixes scikit-learn#5797
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[MRG+1] DOC: updating GridSearchCV's n_jobs parameter accraze/scikit-learn
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