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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) 1999-2008 Soeren Sonnenburg
* Copyright (C) 1999-2008 Fraunhofer Institute FIRST and Max-Planck-Society
*/
#ifndef _SPARSELINEARCLASSIFIER_H__
#define _SPARSELINEARCLASSIFIER_H__
#include "lib/common.h"
#include "features/SparseFeatures.h"
#include "classifier/Classifier.h"
/** class SparseLinearClassifier */
class CSparseLinearClassifier : public CClassifier
{
public:
/** default constructor */
CSparseLinearClassifier();
virtual ~CSparseLinearClassifier();
/** classify all examples
*
* @param output resulting labels
* @return resulting labels
*/
virtual CLabels* classify(CLabels* output=NULL);
/// get output for example "vec_idx"
virtual inline DREAL classify_example(INT vec_idx)
{
return features->dense_dot(1.0, vec_idx, w, w_dim, bias);
}
/** get w
*
* @param dst_w store w in this argument
* @param dst_dims dimension of w
*/
inline void get_w(DREAL** dst_w, INT* dst_dims)
{
ASSERT(dst_w && dst_dims);
ASSERT(w && w_dim>0);
*dst_dims=w_dim;
*dst_w=(DREAL*) malloc(sizeof(DREAL) * (*dst_dims));
ASSERT(*dst_w);
memcpy(*dst_w, w, sizeof(DREAL) * (*dst_dims));
}
/** set w
*
* @param src_w new w
* @param src_w_dim dimension of new w
*/
inline void set_w(DREAL* src_w, INT src_w_dim)
{
w=src_w;
w_dim=src_w_dim;
}
/** set bias
*
* @param b new bias
*/
inline void set_bias(DREAL b)
{
bias=b;
}
/** get bias
*
* @return bias
*/
inline DREAL get_bias()
{
return bias;
}
/** set features
*
* @param feat features to set
*/
inline void set_features(CSparseFeatures<DREAL>* feat)
{
SG_UNREF(features);
SG_REF(feat);
features=feat;
}
/** get features
*
* @return features
*/
inline CSparseFeatures<DREAL>* get_features() { SG_REF(features); return features; }
protected:
/** dimension of w */
INT w_dim;
/** w */
DREAL* w;
/** bias */
DREAL bias;
/** features */
CSparseFeatures<DREAL>* features;
};
#endif
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