Detailed Description

template<class ST>
singleton shogun::CStringFeatures< ST >

Template class StringFeatures implements a list of strings.

As this class is a template the underlying storage type is quite arbitrary and not limited to character strings, but could also be sequences of floating point numbers etc. Strings differ from matrices (cf. CDenseFeatures) in a way that the dimensionality of the feature vectors (i.e. the strings) is not fixed; it may vary between strings.

Most string kernels require StringFeatures but a number of them actually requires strings to have same length.

When preprocessors are attached to string features they may shorten the string, but are not allowed to return strings longer than max_string_length, as some algorithms depend on this.

Also note that string features cannot currently be computed on-the-fly.

(Partly) subset access is supported for this feature type. Simple use the (inherited) add_subset(), remove_subset() functions. If done, all calls that work with features are translated to the subset. See comments to find out whether it is supported for that method. See also CFeatures class documentation

Definition at line 24 of file HammingWordDistance.h.

Inheritance diagram for CStringFeatures< ST >:

[legend]

Public Member Functions
	CStringFeatures ()

	CStringFeatures (EAlphabet alpha)

	CStringFeatures (SGStringList< ST > string_list, EAlphabet alpha)

	CStringFeatures (SGStringList< ST > string_list, CAlphabet *alpha)

	CStringFeatures (CAlphabet *alpha)

	CStringFeatures (const CStringFeatures &orig)

	CStringFeatures (CFile *loader, EAlphabet alpha=DNA)

virtual	~CStringFeatures ()

virtual void	cleanup ()

virtual void	cleanup_feature_vector (int32_t num)

virtual void	cleanup_feature_vectors (int32_t start, int32_t stop)

virtual EFeatureClass	get_feature_class () const

virtual EFeatureType	get_feature_type () const

CAlphabet *	get_alphabet ()

virtual CFeatures *	duplicate () const

SGVector< ST >	get_feature_vector (int32_t num)

void	set_feature_vector (SGVector< ST > vector, int32_t num)

void	enable_on_the_fly_preprocessing ()

void	disable_on_the_fly_preprocessing ()

ST *	get_feature_vector (int32_t num, int32_t &len, bool &dofree)

CStringFeatures< ST > *	get_transposed ()

SGString< ST > *	get_transposed (int32_t &num_feat, int32_t &num_vec)

void	free_feature_vector (ST *feat_vec, int32_t num, bool dofree)

void	free_feature_vector (SGVector< ST > feat_vec, int32_t num)

virtual ST	get_feature (int32_t vec_num, int32_t feat_num)

virtual int32_t	get_vector_length (int32_t vec_num)

virtual int32_t	get_max_vector_length ()

virtual int32_t	get_num_vectors () const

floatmax_t	get_num_symbols ()

floatmax_t	get_max_num_symbols ()

floatmax_t	get_original_num_symbols ()

int32_t	get_order ()

ST	get_masked_symbols (ST symbol, uint8_t mask)

ST	shift_offset (ST offset, int32_t amount)

ST	shift_symbol (ST symbol, int32_t amount)

virtual void	load (CFile *loader)

void	load_ascii_file (char *fname, bool remap_to_bin=true, EAlphabet ascii_alphabet=DNA, EAlphabet binary_alphabet=RAWDNA)

bool	load_fasta_file (const char *fname, bool ignore_invalid=false)

bool	load_fastq_file (const char *fname, bool ignore_invalid=false, bool bitremap_in_single_string=false)

bool	load_from_directory (char *dirname)

void	set_features (SGStringList< ST > feats)

bool	set_features (SGString< ST > *p_features, int32_t p_num_vectors, int32_t p_max_string_length)

bool	append_features (CStringFeatures< ST > *sf)

bool	append_features (SGString< ST > *p_features, int32_t p_num_vectors, int32_t p_max_string_length)

SGStringList< ST >	get_features ()

virtual SGString< ST > *	get_features (int32_t &num_str, int32_t &max_str_len)

virtual SGString< ST > *	copy_features (int32_t &num_str, int32_t &max_str_len)

virtual void	get_features (SGString< ST > *dst, int32_t num_str)

virtual void	save (CFile *writer)

virtual bool	load_compressed (char *src, bool decompress)

virtual bool	save_compressed (char *dest, E_COMPRESSION_TYPE compression, int level)

virtual bool	apply_preprocessor (bool force_preprocessing=false)

int32_t	obtain_by_sliding_window (int32_t window_size, int32_t step_size, int32_t skip=0)

int32_t	obtain_by_position_list (int32_t window_size, CDynamicArray< int32_t > *positions, int32_t skip=0)

bool	obtain_from_char (CStringFeatures< char > *sf, int32_t start, int32_t p_order, int32_t gap, bool rev)

template<class CT >
bool	obtain_from_char_features (CStringFeatures< CT > *sf, int32_t start, int32_t p_order, int32_t gap, bool rev)

bool	have_same_length (int32_t len=-1)

void	embed_features (int32_t p_order)

void	compute_symbol_mask_table (int64_t max_val)

void	unembed_word (ST word, uint8_t *seq, int32_t len)

ST	embed_word (ST *seq, int32_t len)

void	determine_maximum_string_length ()

virtual void	set_feature_vector (int32_t num, ST *string, int32_t len)

virtual void	get_histogram (float64_t *hist, int32_t rows, int32_t *cols, bool normalize=true)

virtual void	create_random (float64_t *hist, int32_t rows, int32_t cols, int32_t num_vec)

virtual CFeatures *	copy_subset (SGVector< index_t > indices)

virtual const char *	get_name () const

virtual void	subset_changed_post ()

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
EFeatureType	get_feature_type () const

template<>
bool	get_masked_symbols (bool symbol, uint8_t mask)

template<>
float32_t	get_masked_symbols (float32_t symbol, uint8_t mask)

template<>
float64_t	get_masked_symbols (float64_t symbol, uint8_t mask)

template<>
floatmax_t	get_masked_symbols (floatmax_t symbol, uint8_t mask)

template<>
bool	shift_offset (bool symbol, int32_t amount)

template<>
float32_t	shift_offset (float32_t symbol, int32_t amount)

template<>
float64_t	shift_offset (float64_t symbol, int32_t amount)

template<>
floatmax_t	shift_offset (floatmax_t symbol, int32_t amount)

template<>
bool	shift_symbol (bool symbol, int32_t amount)

template<>
float32_t	shift_symbol (float32_t symbol, int32_t amount)

template<>
float64_t	shift_symbol (float64_t symbol, int32_t amount)

template<>
floatmax_t	shift_symbol (floatmax_t symbol, int32_t amount)

template<>
bool	obtain_from_char_features (CStringFeatures< CT > *sf, int32_t start, int32_t p_order, int32_t gap, bool rev)

template<>
bool	obtain_from_char_features (CStringFeatures< CT > *sf, int32_t start, int32_t p_order, int32_t gap, bool rev)

template<>
bool	obtain_from_char_features (CStringFeatures< CT > *sf, int32_t start, int32_t p_order, int32_t gap, bool rev)

template<>
void	embed_features (int32_t p_order)

template<>
void	embed_features (int32_t p_order)

template<>
void	embed_features (int32_t p_order)

template<>
void	compute_symbol_mask_table (int64_t max_val)

template<>
void	compute_symbol_mask_table (int64_t max_val)

template<>
void	compute_symbol_mask_table (int64_t max_val)

template<>
float32_t	embed_word (float32_t *seq, int32_t len)

template<>
float64_t	embed_word (float64_t *seq, int32_t len)

template<>
floatmax_t	embed_word (floatmax_t *seq, int32_t len)

template<>
void	unembed_word (float32_t word, uint8_t *seq, int32_t len)

template<>
void	unembed_word (float64_t word, uint8_t *seq, int32_t len)

template<>
void	unembed_word (floatmax_t word, uint8_t *seq, int32_t len)

virtual void	add_preprocessor (CPreprocessor *p)

virtual void	del_preprocessor (int32_t num)

CPreprocessor *	get_preprocessor (int32_t num) const

void	set_preprocessed (int32_t num)

bool	is_preprocessed (int32_t num) const

int32_t	get_num_preprocessed () const

int32_t	get_num_preprocessors () const

void	clean_preprocessors ()

void	list_preprocessors ()

int32_t	get_cache_size () const

virtual bool	reshape (int32_t num_features, int32_t num_vectors)

void	list_feature_obj () const

bool	check_feature_compatibility (CFeatures *f) const

bool	has_property (EFeatureProperty p) const

void	set_property (EFeatureProperty p)

void	unset_property (EFeatureProperty p)

virtual CFeatures *	create_merged_copy (CList *others)

virtual CFeatures *	create_merged_copy (CFeatures *other)

virtual void	add_subset (SGVector< index_t > subset)

virtual void	add_subset_in_place (SGVector< index_t > subset)

virtual void	remove_subset ()

virtual void	remove_all_subsets ()

virtual CSubsetStack *	get_subset_stack ()

virtual CFeatures *	copy_dimension_subset (SGVector< index_t > dims)

virtual bool	support_compatible_class () const

virtual bool	get_feature_class_compatibility (EFeatureClass rhs) const

virtual CFeatures *	shallow_subset_copy ()

virtual CSGObject *	shallow_copy () const

virtual CSGObject *	deep_copy () const

virtual bool	is_generic (EPrimitiveType *generic) const

template<class T >
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

template<>
void	set_generic ()

void	unset_generic ()

virtual void	print_serializable (const char *prefix="")

virtual bool	save_serializable (CSerializableFile file, const char prefix="")

virtual bool	load_serializable (CSerializableFile file, const char prefix="")

void	set_global_io (SGIO *io)

SGIO *	get_global_io ()

void	set_global_parallel (Parallel *parallel)

Parallel *	get_global_parallel ()

void	set_global_version (Version *version)

Version *	get_global_version ()

SGStringList< char >	get_modelsel_names ()

void	print_modsel_params ()

char *	get_modsel_param_descr (const char *param_name)

index_t	get_modsel_param_index (const char *param_name)

void	build_gradient_parameter_dictionary (CMap< TParameter , CSGObject > *dict)

bool	has (const std::string &name) const

template<typename T >
bool	has (const Tag< T > &tag) const

template<typename T , typename U = void>
bool	has (const std::string &name) const

template<typename T >
void	set (const Tag< T > &_tag, const T &value)

template<typename T , typename U = void>
void	set (const std::string &name, const T &value)

template<typename T >
T	get (const Tag< T > &_tag) const

template<typename T , typename U = void>
T	get (const std::string &name) const

virtual void	update_parameter_hash ()

virtual bool	parameter_hash_changed ()

virtual bool	equals (CSGObject *other, float64_t accuracy=0.0, bool tolerant=false)

virtual CSGObject *	clone ()

Static Public Member Functions
static ST *	get_zero_terminated_string_copy (SGString< ST > str)

Public Attributes
SGIO *	io

Parallel *	parallel

Version *	version

Parameter *	m_parameters

Parameter *	m_model_selection_parameters

Parameter *	m_gradient_parameters

uint32_t	m_hash

Protected Member Functions
virtual ST *	compute_feature_vector (int32_t num, int32_t &len)

virtual void	load_serializable_pre () throw (ShogunException)

virtual void	load_serializable_post () throw (ShogunException)

virtual void	save_serializable_pre () throw (ShogunException)

virtual void	save_serializable_post () throw (ShogunException)

template<typename T >
void	register_param (Tag< T > &_tag, const T &value)

template<typename T >
void	register_param (const std::string &name, const T &value)

Protected Attributes
CAlphabet *	alphabet

int32_t	num_vectors

SGString< ST > *	features

ST *	single_string

int32_t	length_of_single_string
	length of prior single string More...

int32_t	max_string_length

floatmax_t	num_symbols
	number of used symbols More...

floatmax_t	original_num_symbols
	original number of used symbols (before higher order mapping) More...

int32_t	order
	order used in higher order mapping More...

ST *	symbol_mask_table
	order used in higher order mapping More...

int32_t	symbol_mask_table_len
	order used in higher order mapping More...

bool	preprocess_on_get
	preprocess on-the-fly? More...

CCache< ST > *	feature_cache

CSubsetStack *	m_subset_stack

Constructor & Destructor Documentation

CStringFeatures ( )

default constructor

Definition at line 21 of file StringFeatures.cpp.

CStringFeatures ( EAlphabet alpha )

constructor

Parameters

alpha alphabet (type) to use for string features

Definition at line 27 of file StringFeatures.cpp.

CStringFeatures	(	SGStringList< ST >	string_list,
		EAlphabet	alpha
	)

constructor

Parameters

string_list
alpha	alphabet (type) to use for string features

Definition at line 37 of file StringFeatures.cpp.

CStringFeatures	(	SGStringList< ST >	string_list,
		CAlphabet *	alpha
	)

constructor

Parameters

string_list
alpha	an actual alphabet

Definition at line 49 of file StringFeatures.cpp.

CStringFeatures ( CAlphabet * alpha )

constructor

Parameters

alpha alphabet to use for string features

Definition at line 61 of file StringFeatures.cpp.

CStringFeatures ( const CStringFeatures< ST > & orig )

copy constructor

Parameters

orig	features to copy

Definition at line 73 of file StringFeatures.cpp.

CStringFeatures	(	CFile *	loader,
		EAlphabet	alpha = `DNA`
	)

constructor

Parameters

loader	File object via which to load data
alpha	alphabet (type) to use for string features

Definition at line 115 of file StringFeatures.cpp.

~CStringFeatures ( )

virtual

destructor

Definition at line 130 of file StringFeatures.cpp.

Member Function Documentation

void add_preprocessor ( CPreprocessor * p )

virtualinherited

add preprocessor

Parameters

p	preprocessor to set

Definition at line 85 of file Features.cpp.

void add_subset ( SGVector< index_t > subset )

virtualinherited

Adds a subset of indices on top of the current subsets (possibly subset of subset). Every call causes a new active index vector to be stored. Added subsets can be removed one-by-one. If this is not needed, add_subset_in_place() should be used (does not store intermediate index vectors)

Calls subset_changed_post() afterwards

Parameters

subset subset of indices to add

Reimplemented in CCombinedFeatures.

Definition at line 310 of file Features.cpp.

void add_subset_in_place ( SGVector< index_t > subset )

virtualinherited

Sets/changes latest added subset. This allows to add multiple subsets with in-place memory requirements. They cannot be removed one-by-one afterwards, only the latest active can. If this is needed, use add_subset(). If no subset is active, this just adds.

Calls subset_changed_post() afterwards

Parameters

subset subset of indices to replace the latest one with.

Definition at line 316 of file Features.cpp.

bool append_features ( CStringFeatures< ST > * sf )

append features If the given string features have a subset, only this will be copied

not possible with subset

Parameters

sf	features to append

Returns: if setting was successful

Definition at line 899 of file StringFeatures.cpp.

bool append_features	(	SGString< ST > *	p_features,
		int32_t	p_num_vectors,
		int32_t	p_max_string_length
	)

append features

not possible with subset

Parameters

p_features	features to append
p_num_vectors	number of vectors
p_max_string_length	maximum string length

note that p_features will be SG_FREE()'d on success

Returns: if setting was successful

Definition at line 921 of file StringFeatures.cpp.

bool apply_preprocessor ( bool force_preprocessing = false )

virtual

apply preprocessor

Parameters

force_preprocessing if preprocssing shall be forced

Returns: if applying was successful

Definition at line 1177 of file StringFeatures.cpp.

void build_gradient_parameter_dictionary ( CMap< TParameter *, CSGObject * > * dict )

inherited

Builds a dictionary of all parameters in SGObject as well of those of SGObjects that are parameters of this object. Dictionary maps parameters to the objects that own them.

Parameters

dict	dictionary of parameters to be built.

Definition at line 630 of file SGObject.cpp.

bool check_feature_compatibility ( CFeatures * f ) const

inherited

check feature compatibility

Parameters

f	features to check for compatibility

Returns: if features are compatible

Definition at line 283 of file Features.cpp.

void clean_preprocessors ( )

inherited

clears all preprocs

Definition at line 116 of file Features.cpp.

void cleanup ( )

virtual

cleanup string features.

removes any subset before

Reimplemented in CStringFileFeatures< ST >.

Definition at line 137 of file StringFeatures.cpp.

void cleanup_feature_vector ( int32_t num )

virtual

cleanup a single feature vector

possible with subset

Parameters

num	number of the vector

Reimplemented in CStringFileFeatures< ST >.

Definition at line 175 of file StringFeatures.cpp.

void cleanup_feature_vectors	(	int32_t	start,
		int32_t	stop
	)

virtual

cleanup multiple feature vectors

possible with subset

Parameters

start	index of first vector to be cleaned
stop	index of the last vector to be cleaned

Definition at line 190 of file StringFeatures.cpp.

CSGObject * clone ( )

virtualinherited

Creates a clone of the current object. This is done via recursively traversing all parameters, which corresponds to a deep copy. Calling equals on the cloned object always returns true although none of the memory of both objects overlaps.

Returns: an identical copy of the given object, which is disjoint in memory. NULL if the clone fails. Note that the returned object is SG_REF'ed

Definition at line 747 of file SGObject.cpp.

ST * compute_feature_vector	(	int32_t	num,
		int32_t &	len
	)

protectedvirtual

compute feature vector for sample num if target is set the vector is written to target len is returned by reference

possible with subset

Parameters

num	which vector
len	length of vector

Returns: feature vector

Definition at line 1651 of file StringFeatures.cpp.

void compute_symbol_mask_table ( int64_t max_val )

compute symbol mask table

required to access bit-based symbols

not implemented for subset

Definition at line 1374 of file StringFeatures.cpp.

void compute_symbol_mask_table ( int64_t max_val )

Definition at line 1889 of file StringFeatures.cpp.

void compute_symbol_mask_table ( int64_t max_val )

Definition at line 1892 of file StringFeatures.cpp.

void compute_symbol_mask_table ( int64_t max_val )

Definition at line 1895 of file StringFeatures.cpp.

CFeatures * copy_dimension_subset ( SGVector< index_t > dims )

virtualinherited

Creates a new CFeatures instance containing only the dimensions of the feature vector which are specified by the provided indices.

This method is needed for feature selection tasks NOT IMPLEMENTED!

Parameters

dims	indices of feature dimensions to copy

Returns: new CFeatures instance with copies of specified features

Reimplemented in CDenseFeatures< ST >, CDenseFeatures< uint32_t >, CDenseFeatures< float64_t >, CDenseFeatures< T >, and CDenseFeatures< uint16_t >.

Definition at line 348 of file Features.cpp.

SGString< ST > * copy_features	(	int32_t &	num_str,
		int32_t &	max_str_len
	)

virtual

copy_features

possible with subset

Parameters

num_str	number of strings (returned)
max_str_len	maximal string length (returned)

Returns: string features

Definition at line 992 of file StringFeatures.cpp.

CFeatures * copy_subset ( SGVector< index_t > indices )

virtual

Creates a new CFeatures instance containing copies of the elements which are specified by the provided indices.

possible with subset

Parameters

indices indices of feature elements to copy

Returns: new CFeatures instance with copies of feature data

Reimplemented from CFeatures.

Definition at line 1610 of file StringFeatures.cpp.

virtual CFeatures* create_merged_copy ( CList * others )

virtualinherited

Takes a list of feature instances and returns a new instance being a concatenation of a copy of this instace's data and the given instancess data. Note that the feature types have to be equal.

NOT IMPLEMENTED!

Parameters

others list of feature objects to append

Returns: new feature object which contains copy of data of this instance and given ones

Reimplemented in CDenseFeatures< ST >, CDenseFeatures< uint32_t >, CDenseFeatures< float64_t >, CDenseFeatures< T >, and CDenseFeatures< uint16_t >.

Definition at line 235 of file Features.h.

virtual CFeatures* create_merged_copy ( CFeatures * other )

virtualinherited

Convenience method for method with same name and list as parameter.

NOT IMPLEMENTED!

Parameters

other feature object to append

Returns: new feature object which contains copy of data of this instance and of given one

Reimplemented in CDenseFeatures< ST >, CDenseFeatures< uint32_t >, CDenseFeatures< float64_t >, CDenseFeatures< T >, CDenseFeatures< uint16_t >, and CCombinedFeatures.

Definition at line 249 of file Features.h.

void create_random	(	float64_t *	hist,
		int32_t	rows,
		int32_t	cols,
		int32_t	num_vec
	)

virtual

create some random strings based on normalized histogram

not possible with subset

Definition at line 1508 of file StringFeatures.cpp.

CSGObject * deep_copy ( ) const

virtualinherited

A deep copy. All the instance variables will also be copied.

Definition at line 231 of file SGObject.cpp.

void del_preprocessor ( int32_t num )

virtualinherited

delete preprocessor from list

Parameters

num	index of preprocessor in list

Definition at line 122 of file Features.cpp.

void determine_maximum_string_length ( )

determine new maximum string length

possible with subset

Definition at line 1431 of file StringFeatures.cpp.

void disable_on_the_fly_preprocessing ( )

call this to disable on the fly feature preprocessing upon call to get_feature_vector. Useful when you manually apply preprocessors.

Definition at line 270 of file StringFeatures.cpp.

CFeatures * duplicate ( ) const

virtual

duplicate feature object

Returns: feature object

Implements CFeatures.

Definition at line 218 of file StringFeatures.cpp.

void embed_features ( int32_t p_order )

embed string features in bit representation in-place

not implemented for subset

Definition at line 1320 of file StringFeatures.cpp.

void embed_features ( int32_t p_order )

Definition at line 1879 of file StringFeatures.cpp.

void embed_features ( int32_t p_order )

Definition at line 1882 of file StringFeatures.cpp.

void embed_features ( int32_t p_order )

Definition at line 1885 of file StringFeatures.cpp.

ST embed_word	(	ST *	seq,
		int32_t	len
	)

embed a single word

Parameters

seq	sequence of size len in a bitfield
len

Definition at line 1418 of file StringFeatures.cpp.

float32_t embed_word	(	float32_t *	seq,
		int32_t	len
	)

Definition at line 1899 of file StringFeatures.cpp.

float64_t embed_word	(	float64_t *	seq,
		int32_t	len
	)

Definition at line 1903 of file StringFeatures.cpp.

floatmax_t embed_word	(	floatmax_t *	seq,
		int32_t	len
	)

Definition at line 1907 of file StringFeatures.cpp.

void enable_on_the_fly_preprocessing ( )

call this to preprocess string features upon call to get_feature_vector

Definition at line 265 of file StringFeatures.cpp.

bool equals	(	CSGObject *	other,
		float64_t	accuracy = `0.0`,
		bool	tolerant = `false`
	)

virtualinherited

Recursively compares the current SGObject to another one. Compares all registered numerical parameters, recursion upon complex (SGObject) parameters. Does not compare pointers!

May be overwritten but please do with care! Should not be necessary in most cases.

Parameters

other	object to compare with
accuracy	accuracy to use for comparison (optional)
tolerant	allows linient check on float equality (within accuracy)

Returns: true if all parameters were equal, false if not

Definition at line 651 of file SGObject.cpp.

void free_feature_vector	(	ST *	feat_vec,
		int32_t	num,
		bool	dofree
	)

free feature vector

possible with subset

Parameters

feat_vec	feature vector to free
num	index in feature cache, possibly from subset
dofree	if vector should be really deleted

Definition at line 357 of file StringFeatures.cpp.

void free_feature_vector	(	SGVector< ST >	feat_vec,
		int32_t	num
	)

free feature vector

possible with subset

Parameters

feat_vec	feature vector to free
num	index in feature cache, possibly from subset

Definition at line 375 of file StringFeatures.cpp.

T get ( const Tag< T > & _tag ) const

inherited

Getter for a class parameter, identified by a Tag. Throws an exception if the class does not have such a parameter.

Parameters

_tag	name and type information of parameter

Returns: value of the parameter identified by the input tag

Definition at line 367 of file SGObject.h.

T get ( const std::string & name ) const

inherited

Getter for a class parameter, identified by a name. Throws an exception if the class does not have such a parameter.

Parameters

name	name of the parameter

Returns: value of the parameter corresponding to the input name and type

Definition at line 388 of file SGObject.h.

CAlphabet * get_alphabet ( )

get alphabet used in string features

Returns: alphabet

Definition at line 212 of file StringFeatures.cpp.

int32_t get_cache_size ( ) const

inherited

get cache size

Returns: cache size

Definition at line 160 of file Features.cpp.

ST get_feature	(	int32_t	vec_num,
		int32_t	feat_num
	)

virtual

get feature

possible with subset

Parameters

vec_num	which vector
feat_num	which feature, possibly from subset

Returns: feature

Definition at line 390 of file StringFeatures.cpp.

EFeatureClass get_feature_class ( ) const

virtual

get feature class

Returns: feature class STRING

Implements CFeatures.

Definition at line 208 of file StringFeatures.cpp.

bool get_feature_class_compatibility ( EFeatureClass rhs ) const

virtualinherited

Given a class in right hand side, does this class support compatible computation?

for example, is this->dot(rhs_prt) valid, where rhs_prt is the class in right hand side

Parameters

rhs	the class in right hand side

Returns: whether this class supports compatible computation

Reimplemented in CDenseSubSamplesFeatures< ST >.

Definition at line 355 of file Features.cpp.