/usr/include/shogun/multiclass/tree/BalancedConditionalProbabilityTree.h is in libshogun-dev 3.2.0-7.3build4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Written (W) 2012 Chiyuan Zhang
* Copyright (C) 2012 Chiyuan Zhang
*/
#ifndef BALANCEDCONDITIONALPROBABILITYTREE_H__
#define BALANCEDCONDITIONALPROBABILITYTREE_H__
#include <shogun/multiclass/tree/ConditionalProbabilityTree.h>
namespace shogun
{
/**
* Balanced Conditional Probability Tree.
*
* The tree is constructed to trade-off the existing regressor's prediction
* and the balance (depth) of the tree. The parameter alpha in [0,1]
* control the trade-off.
*
* * when alpha = 1, best efforts are made to ensure the tree is balanced
* * when alpha = 0, the balance of tree is complete ignored
*
* more balanced tree means better computational efficiency, but usually worse
* performance. See the following paper for more details:
*
* Alina Beygelzimer, John Langford, Yuri Lifshits, Gregory Sorkin, Alex
* Strehl. Conditional Probability Tree Estimation Analysis and Algorithms. UAI 2009.
*/
class CBalancedConditionalProbabilityTree: public CConditionalProbabilityTree
{
public:
/** constructor */
CBalancedConditionalProbabilityTree();
/** destructor */
virtual ~CBalancedConditionalProbabilityTree() {}
/** get name */
virtual const char* get_name() const { return "BalancedConditionalProbabilityTree"; }
/** set alpha */
void set_alpha(float64_t alpha);
/** get alpha */
float64_t get_alpha() const { return m_alpha; }
protected:
/** decide which subtree to go, when training the tree structure.
* @param node the node being decided
* @param ex the example being decided
* @return true if should go left, false otherwise
*/
virtual bool which_subtree(node_t *node, SGVector<float32_t> ex);
private:
int32_t tree_depth(node_t *node);
float64_t m_alpha; ///< trade-off parameter for tree balance
};
} /* shogun */
#endif /* end of include guard: BALANCEDCONDITIONALPROBABILITYTREE_H__ */
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