2013/7/9 Josh Wasserstein <ribonucle...@gmail.com>:
> After running a SVC grid search with linear, rbf and sigmoid kernels, I got
> the following:
>
[snip]
>
> note that the above says that the best estimator is a sigmoid with:
> coef0 = 20.0855369232
> gamma=0.367879441171
> degree=3 ?
>
> I am confused about the above. As far as I understand sigmoids don't have a
> degree: http://scikit-learn.org/dev/modules/svm.html#kernel-functions
>
> Why is GridSearchCV reporting a degree for a sigmoid? Note: I am using
> 0.14-git (master branch)
Straight from the SVC docstring:
degree : int, optional (default=3)
Degree of kernel function.
It is significant only in 'poly'.
This parameter is ignored except when kernel="poly". (I just pushed a
patch that makes this more explicit.)
--
Lars Buitinck
Scientific programmer, ILPS
University of Amsterdam
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