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MeanRule.cpp
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00001 /*
00002  * This program is free software; you can redistribute it and/or modify
00003  * it under the terms of the GNU General Public License as published by
00004  * the Free Software Foundation; either version 3 of the License, or
00005  * (at your option) any later version.
00006  *
00007  * Written (W) 2013 Viktor Gal
00008  * Copyright (C) 2013 Viktor Gal
00009  */
00010 
00011 #include <shogun/ensemble/MeanRule.h>
00012 #include <shogun/lib/SGVector.h>
00013 #include <shogun/lib/SGMatrix.h>
00014 
00015 using namespace shogun;
00016 
00017 CMeanRule::CMeanRule()
00018     : CCombinationRule()
00019 {
00020 
00021 }
00022 
00023 CMeanRule::~CMeanRule()
00024 {
00025 
00026 }
00027 
00028 SGVector<float64_t> CMeanRule::combine(const SGMatrix<float64_t>& ensemble_result) const
00029 {
00030     float64_t* row_sum =
00031         SGMatrix<float64_t>::get_column_sum(ensemble_result.matrix,
00032                                             ensemble_result.num_rows,
00033                                             ensemble_result.num_cols);
00034 
00035     SGVector<float64_t> mean_labels(row_sum, ensemble_result.num_rows);
00036 
00037     float64_t scale = 1/(float64_t)ensemble_result.num_cols;
00038     mean_labels.scale(scale);
00039 
00040     return mean_labels;
00041 }
00042 
00043 float64_t CMeanRule::combine(const SGVector<float64_t>& ensemble_result) const
00044 {
00045     float64_t combined = SGVector<float64_t>::sum(ensemble_result);
00046     combined /= (float64_t)ensemble_result.vlen;
00047     return combined;
00048 }
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