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Why do we get contour around dataset when we use rbf kernel in svm? For example, we use kernel trick to map 2D data into 3D and we can use linear hyperplane to split data, but when we get back to 2D original data , we will get contour around data. Follow the link:

https://scikit-learn.org/stable/auto_examples/svm/plot_svm_kernels.html

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