MyRandomCARTree.cc

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/*
 * Copyright (c) The Shogun Machine Learning Toolbox
 * Written (w) 2014 Parijat Mazumdar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 * The views and conclusions contained in the software and documentation are those
 * of the authors and should not be interpreted as representing official policies,
 * either expressed or implied, of the Shogun Development Team.
 */
 
#include "MyRandomCARTree.h"
#include <shogun/mathematics/Math.h>
 
using namespace shogun;
 
CMyRandomCARTree::CMyRandomCARTree()
: CMyCARTree()
{
    init();
}
 
CMyRandomCARTree::~CMyRandomCARTree()
{
}
 
void CMyRandomCARTree::set_feature_subset_size(index_t size)
{
    REQUIRE(size>0, "Subset size should be greater than 0. %d supplied!\n",size)
    m_randsubset_size=size;
}
 
index_t CMyRandomCARTree::compute_best_attribute(const SGMatrix<float64_t>& mat, const SGVector<float64_t>& weights, CDenseLabels* labels,
    SGVector<float64_t>& left, SGVector<float64_t>& right, SGVector<bool>& is_left_final, index_t &num_missing_final, index_t &count_left,
    index_t &count_right, float64_t& IG, index_t subset_size, const SGVector<index_t>& active_indices)
 
{
    auto num_feats = (m_pre_sort) ? mat.num_cols : mat.num_rows;
 
    // if subset size is not set choose sqrt(num_feats) by default
    if (m_randsubset_size==0)
        m_randsubset_size = std::sqrt((float64_t)num_feats);
    subset_size=m_randsubset_size;
 
    REQUIRE(subset_size<=num_feats, "The Feature subset size(set %d) should be less than"
    " or equal to the total number of features(%d here).\n",subset_size,num_feats)
 
    return CMyCARTree::compute_best_attribute(mat,weights,labels,left,right,is_left_final,num_missing_final,count_left,count_right, IG, subset_size, active_indices);
 
}
 
CMyRandomCARTree* CMyRandomCARTree::clone()
{    
    CMyRandomCARTree* clone_obj =  new CMyRandomCARTree();
    
    SG_REF(clone_obj);
       
    if(!clone_obj->clone_parameters(this))
    {
        SG_UNREF(clone_obj);
        delete clone_obj;
        return NULL;
    }
    
    return clone_obj;
}
 
void CMyRandomCARTree::init()
{
    m_randsubset_size=0;
 
    SG_ADD(&m_randsubset_size,"m_randsubset_size", "random features subset size", MS_NOT_AVAILABLE);
}