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alpha<0 about decision_tree_prune HOT 1 CLOSED

appleyuchi avatar appleyuchi commented on May 31, 2024
alpha<0

from decision_tree_prune.

Comments (1)

appleyuchi avatar appleyuchi commented on May 31, 2024

why does your alpha in ECP_pruning turn out to be negative

alpha is selected from Gt list.

Reference:-Leo Breiman page 235th:

"The pruning process in regression trees usually takes off only two terminal nodes at a time."

with pruning,the MSE can be higer or always lower than unpruned,
so it's right for alpha to be negative or greater than zero

from decision_tree_prune.

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