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src
shogun
features
HashedSparseFeatures.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) 2013 Evangelos Anagnostopoulos
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* Copyright (C) 2013 Evangelos Anagnostopoulos
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*/
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#ifndef _HASHED_SPARSEFEATURES_H__
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#define _HASHED_SPARSEFEATURES_H__
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#include <
shogun/features/SparseFeatures.h
>
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#include <
shogun/features/DotFeatures.h
>
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#include <
shogun/lib/SGSparseVector.h
>
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namespace
shogun
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{
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template
<
class
ST>
class
CSparseFeatures;
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template
<
class
ST>
class
SGSparseVector
;
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class
CDotFeatures
;
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template
<
class
ST>
class
CHashedSparseFeatures
:
public
CDotFeatures
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{
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public
:
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CHashedSparseFeatures
(int32_t size=0,
bool
use_quadr =
false
,
bool
keep_lin_terms =
true
);
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CHashedSparseFeatures
(
CSparseFeatures<ST>
* feats, int32_t d,
bool
use_quadr =
false
,
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bool
keep_lin_terms =
true
);
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CHashedSparseFeatures
(
SGSparseMatrix<ST>
matrix, int32_t d,
bool
use_quadr =
false
,
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bool
keep_lin_terms =
true
);
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CHashedSparseFeatures
(
CFile
* loader, int32_t d,
bool
use_quadr =
false
,
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bool
keep_lin_terms =
true
);
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CHashedSparseFeatures
(
const
CHashedSparseFeatures
& orig);
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virtual
CFeatures
*
duplicate
()
const
;
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virtual
~CHashedSparseFeatures
();
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virtual
int32_t
get_dim_feature_space
()
const
;
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virtual
float64_t
dot
(int32_t vec_idx1,
CDotFeatures
* df,
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int32_t vec_idx2);
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virtual
float64_t
dense_dot
(int32_t vec_idx1,
const
float64_t
* vec2,
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int32_t vec2_len);
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virtual
void
add_to_dense_vec
(
float64_t
alpha, int32_t vec_idx1,
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float64_t
* vec2, int32_t vec2_len,
bool
abs_val =
false
);
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virtual
int32_t
get_nnz_features_for_vector
(int32_t num);
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virtual
void
*
get_feature_iterator
(int32_t vector_index);
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virtual
bool
get_next_feature
(int32_t& index,
float64_t
& value,
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void
* iterator);
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virtual
void
free_feature_iterator
(
void
* iterator);
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virtual
const
char
*
get_name
()
const
;
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virtual
EFeatureType
get_feature_type
()
const
;
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virtual
EFeatureClass
get_feature_class
()
const
;
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virtual
int32_t
get_num_vectors
()
const
;
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SGSparseVector<ST>
get_hashed_feature_vector
(int32_t vec_idx)
const
;
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static
SGSparseVector<ST>
hash_vector
(
SGVector<ST>
vec, int32_t
dim
,
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bool
use_quadratic
=
false
,
bool
keep_linear_terms
=
true
);
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static
SGSparseVector<ST>
hash_vector
(
SGSparseVector<ST>
vec, int32_t dim,
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bool
use_quadratic
=
false
,
bool
keep_linear_terms
=
true
);
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private
:
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void
init(
CSparseFeatures<ST>
* feats, int32_t d,
bool
use_quadr,
bool
keep_lin_terms);
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protected
:
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CSparseFeatures<ST>
*
sparse_feats
;
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int32_t
dim
;
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bool
use_quadratic
;
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bool
keep_linear_terms
;
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};
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}
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#endif // _HASHED_SPARSEFEATURES_H__
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