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Hi,
RapidMiner Studio 7.5 will reduce the selectable minimum to 3.
Regards,
Marco
It seems you still the same issue, I'm also not able to select anything but 60
It works if you add it as a parameter directly in the xml (eg <parameter key="k_max" value="20"/>), looks like this is not added by default
@kayman I do not think this is necessarily a bug---based on parameter description, it simply is the minimum value that is accepted as the maximum range for x-means.
It looks like the algorthim is still testing every value between 2 (default minimum) and 60 so I am not sure if it matters if you would prefer a smaller maximum, since it would be within your range.
I see, didn't notice that to be honnest...
60 seems however like a fairly big number, the problem is that in my specific case the best value is typically below 20, and therefore it takes like 3 times the necessary amount of time to get the best prediction. In itself not such a big deal but when working with larger datasets it does make a nice difference.
Any reason why 60 is chosen, is there a statistical story behind that number (pure out of interest) ?
i've read the source code and there is no comment on why 60 is the min.. The class cites the paper: https://www.cs.cmu.edu/~dpelleg/download/xmeans.pdf for the implementation. Not sure if there is some argument in this one.
I will open up a ticket internally. If you desperatly need it you can extend the class and change the setting.
Best,
Martin
