have a look at : http://scikit-learn.org/stable/auto_examples/svm/plot_separating_hyperplane.html
Alex On Wed, Feb 20, 2013 at 7:48 PM, Andreas Mueller <[email protected]> wrote: > Hi Guillermo. > What do you mean with "get the hyperplane" for other kernels? > The reason that "coef_" only works for the linear kernel is that it > has no correspondence for non-linear kernels. > > And yes, you need to multiply dual_coef_ with X to get coef_ for the > linear kernel. > > Hth, > Andy > > On 02/20/2013 07:12 PM, [email protected] wrote: >> Hi, >> >> I'm using sklearn for training a linear Support Vector Machine, but I cant >> match dual_coef_ with coef_. Here goes the code: >> >> X = np.array([[0, 0], [1, 1]]) >> y = np.array([0, 1]) >> clf = svm.SVC(kernel = "linear") >> clf.fit(X, y) >> >> this gives me a value for clf.dual_coef_ = [[ 1., -1.]] and clf.coef_ = [[ >> 1., 1.]]. How do I get from the dual_coef_ to the normal vector coef_ >> (w)? I understand from >> http://scikit-learn.org/stable/modules/svm.html#svc >> that the dual_coef_ are y_i * alpha_i. In that sense I would only need to >> multiply by X and sum in each coordinate in order to get w, but this gives >> me [1, -1]. >> >> This is just a test. I'm planning to use different kernels, and I >> understand coef_ only works for linear kernels. >> >> Thanks in advance, >> Guillermo. >> >> >> >> >> ------------------------------------------------------------------------------ >> Everyone hates slow websites. So do we. >> Make your web apps faster with AppDynamics >> Download AppDynamics Lite for free today: >> http://p.sf.net/sfu/appdyn_d2d_feb >> _______________________________________________ >> Scikit-learn-general mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/scikit-learn-general > > > ------------------------------------------------------------------------------ > Everyone hates slow websites. So do we. > Make your web apps faster with AppDynamics > Download AppDynamics Lite for free today: > http://p.sf.net/sfu/appdyn_d2d_feb > _______________________________________________ > Scikit-learn-general mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/scikit-learn-general ------------------------------------------------------------------------------ Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_d2d_feb _______________________________________________ Scikit-learn-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/scikit-learn-general
