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Are these pruning conditions acting simultaneously? Or is there a sequence?

APAP Member Posts: 37 Contributor II
in Help
Are these pruning conditions acting simultaneously? Or is there a sequence?

Best Answer

  • APAP Member Posts: 37 Contributor II
    Solution Accepted
    are all the postpruning conditions to be satisfied？

Answers

  • BalazsBaranyBalazsBarany Administrator, Moderator, Employee-RapidMiner, RapidMiner Certified Analyst, RapidMiner Certified Expert Posts: 955 Unicorn
    Hi!

    Prepruning is a set of decisions made before doing a split in the decision tree. The constraints specified in the parameters are used to decide if a split is even being done or not. For example, if minimal size for split applies (the leaf already consists of less than 4 elements), no further processing is done on this part.

    "Pruning" is actually postpruning. It does the split and calculates a statistic measure for its quality. If the confidence threshold is not met, the split will be undone.

    So obviously prepruning is before postpruning, and the simple rule-based decisions (minimal size for split) are done before attempted before doing a split attempt.

    Regards,
    Balázs
  • BalazsBaranyBalazsBarany Administrator, Moderator, Employee-RapidMiner, RapidMiner Certified Analyst, RapidMiner Certified Expert Posts: 955 Unicorn
    There is only one in your screenshot, but yes, all conditions need to be satisfied.
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