SHOGUN  5.0.0
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Modules
LogPlusOne.cpp
Go to the documentation of this file.
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 3 of the License, or
5  * (at your option) any later version.
6  *
7  * Written (W) 1999-2009 Soeren Sonnenburg
8  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
9  */
10 
15 
16 using namespace shogun;
17 
20 {
21 }
22 
23 
25 {
26 }
27 
29 bool CLogPlusOne::init(CFeatures* features)
30 {
31  ASSERT(features->get_feature_class()==C_DENSE)
32  ASSERT(features->get_feature_type()==F_DREAL)
33 
34  return true;
35 }
36 
39 {
40 }
41 
43 bool CLogPlusOne::load(FILE* f)
44 {
47  return false;
48 }
49 
51 bool CLogPlusOne::save(FILE* f)
52 {
55  return false;
56 }
57 
62 {
63  SGMatrix<float64_t> feature_matrix =
64  ((CDenseFeatures<float64_t>*)features)->get_feature_matrix();
65 
66  for (int32_t i=0; i<feature_matrix.num_cols; i++)
67  {
68  for (int32_t j=0; j<feature_matrix.num_rows; j++)
69  feature_matrix.matrix[i*feature_matrix.num_rows+j] =
70  CMath::log(feature_matrix.matrix[i*feature_matrix.num_rows+j]+1.0);
71  }
72  return feature_matrix;
73 }
74 
78 {
79  float64_t* log_vec = SG_MALLOC(float64_t, vector.vlen);
80 
81  for (int32_t i=0; i<vector.vlen; i++)
82  log_vec[i]=CMath::log(vector.vector[i]+1.0);
83 
84  return SGVector<float64_t>(log_vec,vector.vlen);
85 }
#define SG_RESET_LOCALE
Definition: SGIO.h:86
virtual void cleanup()
cleanup
Definition: LogPlusOne.cpp:38
virtual SGVector< float64_t > apply_to_feature_vector(SGVector< float64_t > vector)
Definition: LogPlusOne.cpp:77
index_t num_cols
Definition: SGMatrix.h:376
#define SG_SET_LOCALE_C
Definition: SGIO.h:85
index_t num_rows
Definition: SGMatrix.h:374
index_t vlen
Definition: SGVector.h:494
#define ASSERT(x)
Definition: SGIO.h:201
Template class DensePreprocessor, base class for preprocessors (cf. CPreprocessor) that apply to CDen...
double float64_t
Definition: common.h:50
virtual EFeatureClass get_feature_class() const =0
virtual bool load(FILE *f)
initialize preprocessor from file
Definition: LogPlusOne.cpp:43
virtual ~CLogPlusOne()
Definition: LogPlusOne.cpp:24
virtual bool save(FILE *f)
save preprocessor init-data to file
Definition: LogPlusOne.cpp:51
virtual SGMatrix< float64_t > apply_to_feature_matrix(CFeatures *features)
Definition: LogPlusOne.cpp:61
all of classes and functions are contained in the shogun namespace
Definition: class_list.h:18
The class Features is the base class of all feature objects.
Definition: Features.h:68
static float64_t log(float64_t v)
Definition: Math.h:922
virtual EFeatureType get_feature_type() const =0

SHOGUN Machine Learning Toolbox - Documentation