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src
shogun
multiclass
ecoc
ECOCRandomSparseEncoder.h
浏览该文件的文档.
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/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* Written (W) 2012 Chiyuan Zhang
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* Copyright (C) 2012 Chiyuan Zhang
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*/
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#ifndef ECOCRANDOMSPARSEENCODER_H__
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#define ECOCRANDOMSPARSEENCODER_H__
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#include <
shogun/mathematics/Math.h
>
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#include <
shogun/multiclass/ecoc/ECOCEncoder.h
>
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namespace
shogun
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{
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class
CECOCRandomSparseEncoder
:
public
CECOCEncoder
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{
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public
:
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CECOCRandomSparseEncoder
(int32_t maxiter=10000, int32_t codelen=0,
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float64_t
pzero=0.5,
float64_t
pposone=0.25,
float64_t
pnegone=0.25);
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virtual
~CECOCRandomSparseEncoder
() {}
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void
set_probability
(
float64_t
pzero,
float64_t
pposone,
float64_t
pnegone);
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virtual
const
char
*
get_name
()
const
{
return
"ECOCRandomSparseEncoder"
; }
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int32_t
get_default_code_length
(int32_t num_classes)
const
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{
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return
static_cast<
int32_t
>
(
CMath::round
(15 *
CMath::log
(num_classes)));
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}
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virtual
SGMatrix<int32_t>
create_codebook
(int32_t num_classes);
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protected
:
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int32_t
m_maxiter
;
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int32_t
m_codelen
;
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float64_t
m_pzero
;
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float64_t
m_pposone
;
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float64_t
m_pnegone
;
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private
:
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bool
check_probability(
float64_t
pzero,
float64_t
pposone,
float64_t
pnegone)
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{
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if
(
CMath::abs
(pzero + pposone + pnegone - 1) > 1e-5)
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return
false
;
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return
true
;
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}
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void
init();
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};
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}
/* shogun */
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#endif
/* end of include guard: ECOCRANDOMSPARSEENCODER_H__ */
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