Detailed Description

ECOC Random Sparse Encoder.

Given probabilities P(0), P(+1) and P(-1) (that sums to 1), the codebook element is randomly selected according to those probabilities. However, to avoid generating invalid code (i.e. not both +1 and -1 are present), we use a heuristic modification here:

randomly select two positions and assign them (+1,-1) or (-1,+1) with probability 0.5, 0.5 respectively
random sample and assign values to the rest of the code positions

In this way, we guarantee that both +1 and -1 are present in the code. However, the effective probability is changed to Q. Assume number of classes is K, then

Q(0) = (K-2)/K * P(0)
Q(+1) = 1/K + (K-2)/K * P(+1)
Q(-1) = 1/K + (K-2)/K * P(-1)

Definition at line 36 of file ECOCRandomSparseEncoder.h.

Inheritance diagram for CECOCRandomSparseEncoder:

[legend]

Public Member Functions
	CECOCRandomSparseEncoder (int32_t maxiter=10000, int32_t codelen=0, float64_t pzero=0.5, float64_t pposone=0.25, float64_t pnegone=0.25)
virtual	~CECOCRandomSparseEncoder ()
void	set_probability (float64_t pzero, float64_t pposone, float64_t pnegone)
virtual const char *	get_name () const
int32_t	get_default_code_length (int32_t num_classes) const
virtual SGMatrix< int32_t >	create_codebook (int32_t num_classes)
virtual CSGObject *	shallow_copy () const
virtual CSGObject *	deep_copy () const
virtual bool	is_generic (EPrimitiveType *generic) const
template<class T >
void	set_generic ()
void	unset_generic ()
virtual void	print_serializable (const char *prefix="")
virtual bool	save_serializable (CSerializableFile file, const char prefix="", int32_t param_version=Version::get_version_parameter())
virtual bool	load_serializable (CSerializableFile file, const char prefix="", int32_t param_version=Version::get_version_parameter())
DynArray< TParameter * > *	load_file_parameters (const SGParamInfo param_info, int32_t file_version, CSerializableFile file, const char *prefix="")
DynArray< TParameter * > *	load_all_file_parameters (int32_t file_version, int32_t current_version, CSerializableFile file, const char prefix="")
void	map_parameters (DynArray< TParameter * > param_base, int32_t &base_version, DynArray< const SGParamInfo > *target_param_infos)
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)
virtual bool	update_parameter_hash ()
virtual bool	equals (CSGObject *other, float64_t accuracy=0.0)
virtual CSGObject *	clone ()

Public Attributes
SGIO *	io
Parallel *	parallel
Version *	version
Parameter *	m_parameters
Parameter *	m_model_selection_parameters
Parameter *	m_gradient_parameters
ParameterMap *	m_parameter_map
uint32_t	m_hash

Protected Member Functions
virtual TParameter *	migrate (DynArray< TParameter * > param_base, const SGParamInfo target)
virtual void	one_to_one_migration_prepare (DynArray< TParameter * > param_base, const SGParamInfo target, TParameter &replacement, TParameter &to_migrate, char *old_name=NULL)
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)

Protected Attributes
int32_t	m_maxiter
int32_t	m_codelen
float64_t	m_pzero
float64_t	m_pposone
float64_t	m_pnegone

Constructor & Destructor Documentation

CECOCRandomSparseEncoder	(	int32_t	maxiter = `10000`,
		int32_t	codelen = `0`,
		float64_t	pzero = `0.5`,
		float64_t	pposone = `0.25`,
		float64_t	pnegone = `0.25`
	)

constructor

Parameters

maxiter	max number of iterations
codelen	code length, if set to zero, will be computed automatically via get_default_code_length
pzero	probability of zero
pposone	probability of +1
pnegone	probability of -1

See Also: get_default_code_length

Definition at line 20 of file ECOCRandomSparseEncoder.cpp.

virtual ~CECOCRandomSparseEncoder ( )

virtual

destructor

Definition at line 52 of file ECOCRandomSparseEncoder.h.

Member Function Documentation

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 1196 of file SGObject.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 1313 of file SGObject.cpp.

SGMatrix< int32_t > create_codebook ( int32_t num_classes )

virtual

init codebook.

Parameters

num_classes number of classes in this problem

Implements CECOCEncoder.

Definition at line 49 of file ECOCRandomSparseEncoder.cpp.

virtual CSGObject* deep_copy ( ) const

virtualinherited

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

Definition at line 160 of file SGObject.h.

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

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)

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

Definition at line 1217 of file SGObject.cpp.

int32_t get_default_code_length ( int32_t num_classes ) const

get default code length

Parameters

num_classes number of classes

In Sparse Random Coding, 15 * log(num_classes) is suggested as code length. See

S. Escalera, O. Pujol, and P. Radeva. Separability of ternary codes for sparse designs of error-correcting output codes. Pattern Recognition Letters, 30:285-297, 2009.

Definition at line 73 of file ECOCRandomSparseEncoder.h.

SGIO * get_global_io ( )

inherited

get the io object

Returns: io object

Definition at line 214 of file SGObject.cpp.

Parallel * get_global_parallel ( )

inherited

get the parallel object

Returns: parallel object

Definition at line 249 of file SGObject.cpp.

Version * get_global_version ( )

inherited

get the version object

Returns: version object

Definition at line 262 of file SGObject.cpp.

SGStringList< char > get_modelsel_names ( )

inherited

Returns: vector of names of all parameters which are registered for model selection

Definition at line 1100 of file SGObject.cpp.

char * get_modsel_param_descr ( const char * param_name )

inherited

Returns description of a given parameter string, if it exists. SG_ERROR otherwise

Parameters

param_name name of the parameter

Returns: description of the parameter

Definition at line 1124 of file SGObject.cpp.

index_t get_modsel_param_index ( const char * param_name )

inherited

Returns index of model selection parameter with provided index

Parameters

param_name name of model selection parameter

Returns: index of model selection parameter with provided name, -1 if there is no such

Definition at line 1137 of file SGObject.cpp.

virtual const char* get_name ( ) const

virtual

get name

Reimplemented from CECOCEncoder.

Definition at line 62 of file ECOCRandomSparseEncoder.h.

bool is_generic ( EPrimitiveType * generic ) const

virtualinherited

If the SGSerializable is a class template then TRUE will be returned and GENERIC is set to the type of the generic.

Parameters

generic set to the type of the generic if returning TRUE

Returns: TRUE if a class template.

Definition at line 268 of file SGObject.cpp.

DynArray< TParameter * > * load_all_file_parameters	(	int32_t	file_version,
		int32_t	current_version,
		CSerializableFile *	file,
		const char *	prefix = `""`
	)

inherited

maps all parameters of this instance to the provided file version and loads all parameter data from the file into an array, which is sorted (basically calls load_file_parameter(...) for all parameters and puts all results into a sorted array)

Parameters

file_version	parameter version of the file
current_version	version from which mapping begins (you want to use Version::get_version_parameter() for this in most cases)
file	file to load from
prefix	prefix for members

Returns: (sorted) array of created TParameter instances with file data

Definition at line 673 of file SGObject.cpp.

DynArray< TParameter * > * load_file_parameters	(	const SGParamInfo *	param_info,
		int32_t	file_version,
		CSerializableFile *	file,
		const char *	prefix = `""`
	)

inherited

loads some specified parameters from a file with a specified version The provided parameter info has a version which is recursively mapped until the file parameter version is reached. Note that there may be possibly multiple parameters in the mapping, therefore, a set of TParameter instances is returned

Parameters

param_info	information of parameter
file_version	parameter version of the file, must be <= provided parameter version
file	file to load from
prefix	prefix for members

Returns: new array with TParameter instances with the attached data

Definition at line 514 of file SGObject.cpp.

bool load_serializable	(	CSerializableFile *	file,
		const char *	prefix = `""`,
		int32_t	param_version = `Version::get_version_parameter()`
	)

virtualinherited

Load this object from file. If it will fail (returning FALSE) then this object will contain inconsistent data and should not be used!

Parameters

file	where to load from
prefix	prefix for members
param_version	(optional) a parameter version different to (this is mainly for testing, better do not use)

Returns: TRUE if done, otherwise FALSE

Definition at line 345 of file SGObject.cpp.

void load_serializable_post ( ) throw (ShogunException)

protectedvirtualinherited

Can (optionally) be overridden to post-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::LOAD_SERIALIZABLE_POST is called.

Exceptions

ShogunException Will be thrown if an error occurres.

Reimplemented in CKernel, CWeightedDegreePositionStringKernel, CList, CAlphabet, CLinearHMM, CGaussianKernel, CInverseMultiQuadricKernel, CCircularKernel, and CExponentialKernel.

Definition at line 1029 of file SGObject.cpp.

void load_serializable_pre ( ) throw (ShogunException)

protectedvirtualinherited

Can (optionally) be overridden to pre-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::LOAD_SERIALIZABLE_PRE is called.

Exceptions

ShogunException Will be thrown if an error occurres.

Reimplemented in CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool >, CDynamicArray< uint64_t >, and CDynamicObjectArray.

Definition at line 1024 of file SGObject.cpp.

void map_parameters	(	DynArray< TParameter * > *	param_base,
		int32_t &	base_version,
		DynArray< const SGParamInfo * > *	target_param_infos
	)

inherited

Takes a set of TParameter instances (base) with a certain version and a set of target parameter infos and recursively maps the base level wise to the current version using CSGObject::migrate(...). The base is replaced. After this call, the base version containing parameters should be of same version/type as the initial target parameter infos. Note for this to work, the migrate methods and all the internal parameter mappings have to match

Parameters

param_base	set of TParameter instances that are mapped to the provided target parameter infos
base_version	version of the parameter base
target_param_infos	set of SGParamInfo instances that specify the target parameter base

Definition at line 711 of file SGObject.cpp.

TParameter * migrate	(	DynArray< TParameter * > *	param_base,
		const SGParamInfo *	target
	)

protectedvirtualinherited

creates a new TParameter instance, which contains migrated data from the version that is provided. The provided parameter data base is used for migration, this base is a collection of all parameter data of the previous version. Migration is done FROM the data in param_base TO the provided param info Migration is always one version step. Method has to be implemented in subclasses, if no match is found, base method has to be called.

If there is an element in the param_base which equals the target, a copy of the element is returned. This represents the case when nothing has changed and therefore, the migrate method is not overloaded in a subclass

Parameters

param_base	set of TParameter instances to use for migration
target	parameter info for the resulting TParameter

Returns: a new TParameter instance with migrated data from the base of the type which is specified by the target parameter

Definition at line 918 of file SGObject.cpp.

void one_to_one_migration_prepare	(	DynArray< TParameter * > *	param_base,
		const SGParamInfo *	target,
		TParameter *&	replacement,
		TParameter *&	to_migrate,
		char *	old_name = `NULL`
	)

protectedvirtualinherited

This method prepares everything for a one-to-one parameter migration. One to one here means that only ONE element of the parameter base is needed for the migration (the one with the same name as the target). Data is allocated for the target (in the type as provided in the target SGParamInfo), and a corresponding new TParameter instance is written to replacement. The to_migrate pointer points to the single needed TParameter instance needed for migration. If a name change happened, the old name may be specified by old_name. In addition, the m_delete_data flag of to_migrate is set to true. So if you want to migrate data, the only thing to do after this call is converting the data in the m_parameter fields. If unsure how to use - have a look into an example for this. (base_migration_type_conversion.cpp for example)

Parameters

param_base	set of TParameter instances to use for migration
target	parameter info for the resulting TParameter
replacement	(used as output) here the TParameter instance which is returned by migration is created into
to_migrate	the only source that is used for migration
old_name	with this parameter, a name change may be specified

Definition at line 858 of file SGObject.cpp.

void print_modsel_params ( )

inherited

prints all parameter registered for model selection and their type

Definition at line 1076 of file SGObject.cpp.

void print_serializable ( const char * prefix = "" )

virtualinherited

prints registered parameters out

Parameters

prefix prefix for members

Definition at line 280 of file SGObject.cpp.

bool save_serializable	(	CSerializableFile *	file,
		const char *	prefix = `""`,
		int32_t	param_version = `Version::get_version_parameter()`
	)

virtualinherited

Save this object to file.

Parameters

file	where to save the object; will be closed during returning if PREFIX is an empty string.
prefix	prefix for members
param_version	(optional) a parameter version different to (this is mainly for testing, better do not use)

Returns: TRUE if done, otherwise FALSE

Definition at line 286 of file SGObject.cpp.

void save_serializable_post ( ) throw (ShogunException)

protectedvirtualinherited

Can (optionally) be overridden to post-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::SAVE_SERIALIZABLE_POST is called.

Exceptions

ShogunException Will be thrown if an error occurres.

Reimplemented in CKernel.

Definition at line 1039 of file SGObject.cpp.

void save_serializable_pre ( ) throw (ShogunException)

protectedvirtualinherited

Can (optionally) be overridden to pre-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::SAVE_SERIALIZABLE_PRE is called.

Exceptions

ShogunException Will be thrown if an error occurres.

Reimplemented in CKernel, CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool >, CDynamicArray< uint64_t >, and CDynamicObjectArray.

Definition at line 1034 of file SGObject.cpp.

void set_generic< complex128_t > ( )

inherited

set generic type to T

Definition at line 41 of file SGObject.cpp.

void set_global_io ( SGIO * io )

inherited

set the io object

Parameters

io	io object to use

Definition at line 207 of file SGObject.cpp.

void set_global_parallel ( Parallel * parallel )

inherited

set the parallel object

Parameters

parallel parallel object to use

Definition at line 220 of file SGObject.cpp.

void set_global_version ( Version * version )

inherited

set the version object

Parameters

version version object to use

Definition at line 255 of file SGObject.cpp.

void set_probability	(	float64_t	pzero,
		float64_t	pposone,
		float64_t	pnegone
	)

set probability

Parameters

pzero	probability of zero
pposone	probability of +1
pnegone	probability of -1

Definition at line 39 of file ECOCRandomSparseEncoder.cpp.

virtual CSGObject* shallow_copy ( ) const

virtualinherited

A shallow copy. All the SGObject instance variables will be simply assigned and SG_REF-ed.

Reimplemented in CGaussianKernel.

Definition at line 151 of file SGObject.h.

void unset_generic ( )

inherited

unset generic type

this has to be called in classes specializing a template class

Definition at line 275 of file SGObject.cpp.

bool update_parameter_hash ( )

virtualinherited

Updates the hash of current parameter combination.

Returns: bool if parameter combination has changed since last update.

Definition at line 227 of file SGObject.cpp.

Member Data Documentation

SGIO* io

inherited

io

Definition at line 514 of file SGObject.h.

int32_t m_codelen

protected

code length

Definition at line 87 of file ECOCRandomSparseEncoder.h.

Parameter* m_gradient_parameters

inherited

parameters wrt which we can compute gradients

Definition at line 529 of file SGObject.h.

uint32_t m_hash

inherited

Hash of parameter values

Definition at line 535 of file SGObject.h.

int32_t m_maxiter

protected

maximum number of iterations

Definition at line 85 of file ECOCRandomSparseEncoder.h.

Parameter* m_model_selection_parameters

inherited

model selection parameters

Definition at line 526 of file SGObject.h.

ParameterMap* m_parameter_map

inherited

map for different parameter versions

Definition at line 532 of file SGObject.h.

Parameter* m_parameters

inherited

parameters

Definition at line 523 of file SGObject.h.

float64_t m_pnegone

protected

probability of -1

Definition at line 93 of file ECOCRandomSparseEncoder.h.

float64_t m_pposone

protected

probability of +1

Definition at line 91 of file ECOCRandomSparseEncoder.h.

float64_t m_pzero

protected

probability of zero

Definition at line 89 of file ECOCRandomSparseEncoder.h.

Parallel* parallel

inherited

parallel

Definition at line 517 of file SGObject.h.

Version* version

inherited

version

Definition at line 520 of file SGObject.h.

The documentation for this class was generated from the following files:

Detailed Description

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation