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Saved weights with weights to data operator - How can I use them with the select by weight operator?

green_teagreen_tea Member Posts: 11 image Learner II
edited January 2019 in Help
Hello community,
this might be a rather dumb question, but I am struggling with the way how the weights operators work. I did a filter-based feature selection
with multiple different filters and combined the results in one table. The columns in that table are Attribute, Information Gain, Chi-Squared, etc. The rows look like the following:

Row No. | Attribute | Information Gain | Chi-Quared
     1            A                   0.59                0.87
     2            B                   0.26                  1
     3            C                     1                   0.67

Now I want to select the top 10 features of my example set using this - unfortunetly I do not understand how I can get the right weight vector to apply in select weights. I can divide the weights table for each attribute again so it only consists of e.g. Attribute and Information Gain, but how can I get those weights applied with the select by weight Operator. I already watched the video by Markus Hoffman, but am still struggling. Any help is appreciated!



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  • lionelderkrikorlionelderkrikor RapidMiner Certified Analyst, Member Posts: 1,195 image Unicorn
    Hi @green_tea,

    Use the Data to Weights operator.

    Regards,

    Lionel
  • green_teagreen_tea Member Posts: 11 image Learner II
    I tried that, but it generates a weight vector with only 1s as values. From the RapidMiner Documentation:
    This operator simply generates an attribute weights vector with weight 1.0 for each input attribute.
    How can I generate a weight vactor that has the weights from my stored exampleSet (which was created with Weights to Data Operator)?
    Best regards,
    green_tea
  • lionelderkrikorlionelderkrikor RapidMiner Certified Analyst, Member Posts: 1,195 image Unicorn
    Hi @green_tea,

    You can not use directly the weights from the output of Weight by Information Gain, Weight by Chi Squared  operator(s) ?

    Regards,

    Lionel


  • green_teagreen_tea Member Posts: 11 image Learner II
    in theory, yes. In practice, I ran 30+ filter-based weight operators with different example sets that took a long time to complete execution. Using the direct weights would require me to run them again for which I lack the time unfortunately.
    In the end I found a work around so I didn't check the converters extension @mschmitz. Thanks for the tip though! I will mark the post as solved, but to all future readers, I did not test if it actually works.
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