One Class SVM not working correctly

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Andrea Lanza
Andrea Lanza 2023-11-25
评论： Lorenzo Zarantonello 2023-12-9
Hi all, I have to train a one class SVM for anomaly detection. I have a dataset with two features. I trained the model on normal instances with ocsvm function. What I don't understand are the contour lines for the ocsvm scores... I do not expect those to be like that. In the figure are represented the normal instances in the space (feature1, feature2) and the contour lines corresponding to some values of ocsvm score. They are simply absurd, not like the example see on the matlab guide. I would expect ellipsoidal contour lines, not these! Any help? Thank you!
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Andrea Lanza
Andrea Lanza 2023-11-29
fitcsvm with one class option makes the contour lines normal, so I would say that there is definitely something wrong in the ocsvm function

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Angelo Yeo
Angelo Yeo 2023-11-30
编辑：Angelo Yeo 2023-11-30
Thank you for reporting this. I can see that something is broken in ocsvm. Can you please contact Technical Support and report this issue?
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Angelo Yeo
Angelo Yeo 2023-12-8
@Lorenzo Zarantonello, please reach out to Technical Support if you need further explanation on the issue and workaround. I don't think I'm allowed to share it on public technical forums.

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