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Performance (cost) sample not behaving as expected

MaartenKMaartenK Member Posts: 15 Contributor II
I was looking into the performance (cost) component. It comes with a tutorial. The tutorial applies naive bayes to the Golf dataset using split validation. The outcome should be that 1 of 4 items is misclassified. However, if i run it, all items are misclasified as follows (play -> prediction):
yes -> no, no-> yes, yes -> no, yes -> no).
My collegue did not have this result. I am running this on an AMD Ryzen 5 3600 with RapidMiner 9.8.001. 
I did not change any of the paramters in the tutorial.
I Also rebuild the model from scratch which had the same results.
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Best Answer

  • lionelderkrikorlionelderkrikor Moderator, RapidMiner Certified Analyst, Member Posts: 1,173   Unicorn
    Solution Accepted
    Hi @MaartenK,

    I'm only able to reproduce what you observe if  : 
     - I check use local random seed and local random seed = 1992 in the parameters of Split Validation operator

    Otherwise if use local random seed is unchecked, i have in deed 25 % of the sample misclassified like your colleague ….

    Thus are your sure that you have not checked use local random seed in the parameters of Split Validation operator.

    Regards,

    Lionel

Answers

  • MaartenKMaartenK Member Posts: 15 Contributor II
    edited December 2020
    Hi Lionel,

    That must be it.  1992 was the default local random seed in previous versions of RM and i set at as default to be able to reproduce the results from my thesis. The current default is 2001. If I use that then it works as described in the help. 
    Still interesting how that would generate such different results (4 classification errors vs one). Probably due to the fact that the golf dataset is very small.
    Thanks for the fast response!

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