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# "Two spiral problem with SVM in Rapidminer"

Hello everybody.

I am trying to get Rapidminer 5.0.006 to solve the famous two-spiral problem with SVM (Clustering).

I found a sample in Rapidminer which is practically what I search for,

only with a different dataset, namely "three ring clusters".

This "three ring clusters"-sample can be found under:

Samples - processes - 07_Clustering - 10_SVClustering.

This sample as it is works just fine, but as I simply change the targetfunction

in the ExampleSetGenerator from "three ring clusters" to "spiral cluster",

the results I get make no sense. Mostly I get 1 cluster, sometimes more but never good ones

that seperate the spiral-arms as they should be.

No matter what parameters I choose for the SupportVectorClustering!

(I know from experiments with LibSVM the values for the parameters C and Gamma

that do an excellent job for this problem).

Can anybody help me with this? Thank you in advance!

Greetings,

speedyjb

I am trying to get Rapidminer 5.0.006 to solve the famous two-spiral problem with SVM (Clustering).

I found a sample in Rapidminer which is practically what I search for,

only with a different dataset, namely "three ring clusters".

This "three ring clusters"-sample can be found under:

Samples - processes - 07_Clustering - 10_SVClustering.

This sample as it is works just fine, but as I simply change the targetfunction

in the ExampleSetGenerator from "three ring clusters" to "spiral cluster",

the results I get make no sense. Mostly I get 1 cluster, sometimes more but never good ones

that seperate the spiral-arms as they should be.

No matter what parameters I choose for the SupportVectorClustering!

(I know from experiments with LibSVM the values for the parameters C and Gamma

that do an excellent job for this problem).

Can anybody help me with this? Thank you in advance!

Greetings,

speedyjb

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## Answers

1,751RM FounderCheers,

Ingo

2Contributor IPerhaps searching for the best parameters via genetic optimization, grid search or something similar?

(To save time and effort).

In the end I just want to be able to replicate the results I got with libSVM in Rapidminer on the 2 spiral problem

and be able to take advantage of all the surplus Rapidminer gives with its build-in features.

But first things first: trying to get Rapidminer going on this one!

Greetings,

speedyjb

1,751RM FounderCheers,

Ingo