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what is the usage of parameter “confidence” in operator “Decision Tree”?
lg21c
what is the usage of parameter “confidence” in operator “Decision Tree”?
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YYH
Hi
@lg21c
,
Not sure about the definition of f and q in your probability function. But you can refer to the source code of decision tree and pessimisticpruner.java scripts here
https://github.com/rapidminer/rapidminer-studio-modular/blob/master/rapidminer-studio-core/src/main/java/com/rapidminer/operator/learner/tree/DecisionTreeLearner.java
https://github.com/rapidminer/rapidminer-studio-modular/blob/master/rapidminer-studio-core/src/main/java/com/rapidminer/operator/learner/tree/PessimisticPruner.java
If the tree grows too big, the model is easily overfitting. The confidence level is used to determine whether or not prune the branches based on
pessimistic errors.
HTH!
YY
lg21c
Hi
@
yyhuang
,
it
would
be a lot
easier
for people to
know the complex parameters if rapidminer company provide detailed technical manual,many users
can't read java
lg21c
The formula in the program is complicated,I just want to know
YYH
This operator for decision tree is the same as Quinlan's C4.5 or CART depending on the
criterion, e.g. using gain_ratio or Gini.
Useful reference
Quinlan,J.R.: C4.5: Programs for Machine Learning Morgan Kauffman, 1993
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