structure_ratio_prune: Tree structure ratio for prune.
In brunaw/hebart: Hierachical Embedded Bayesian Additive Regression Trees

structure_ratio_prune

R Documentation

Tree structure ratio for prune.

Description

Tree structure ratio of the candidate tree and the previous tree, given that the action step was a prune.

Usage

structure_ratio_prune(old_tree, tree, current_node, var_in_prune, p_split)

Arguments

`old_tree`	The previous tree
`tree`	The current tree
`current_node`	The current pruned node.
`var_in_prune`	The variable that was split in the node chosen to be pruned.
`p_split`	The number of available predictors

Details

For the tree structure ratio of the new pruned tree, we need to calculate an inversion of the tree structure ratio for the grow. We need the probabilities of: 1. Splitting at node n 2. Splitting at the node of the left 3. Splitting at the node of the right 4. Using each rule at node n