CMultitaskKernelNormalizer Class Reference

Detailed Description

The MultitaskKernel allows Multitask Learning via a modified kernel function.

This effectively normalizes the vectors in feature space to norm 1 (see CSqrtDiagKernelNormalizer)

Definition at line 31 of file MultitaskKernelNormalizer.h.

Inheritance diagram for CMultitaskKernelNormalizer:

Public Member Functions
	CMultitaskKernelNormalizer ()
	CMultitaskKernelNormalizer (std::vector< int32_t > task_vector)
virtual	~CMultitaskKernelNormalizer ()
virtual bool	init (CKernel *k)
int32_t	get_num_unique_tasks (std::vector< int32_t > vec)
virtual float64_t	normalize (float64_t value, int32_t idx_lhs, int32_t idx_rhs)
virtual float64_t	normalize_lhs (float64_t value, int32_t idx_lhs)
virtual float64_t	normalize_rhs (float64_t value, int32_t idx_rhs)
std::vector< int32_t >	get_task_vector_lhs () const
void	set_task_vector_lhs (std::vector< int32_t > vec)
std::vector< int32_t >	get_task_vector_rhs () const
void	set_task_vector_rhs (std::vector< int32_t > vec)
void	set_task_vector (std::vector< int32_t > vec)
float64_t	get_task_similarity (int32_t task_lhs, int32_t task_rhs)
void	set_task_similarity (int32_t task_lhs, int32_t task_rhs, float64_t similarity)
virtual const char *	get_name () const
CMultitaskKernelNormalizer *	KernelNormalizerToMultitaskKernelNormalizer (CKernelNormalizer *n)
Public Member Functions inherited from CKernelNormalizer
	CKernelNormalizer ()
virtual	~CKernelNormalizer ()
virtual void	register_params ()
ENormalizerType	get_normalizer_type ()
void	set_normalizer_type (ENormalizerType type)
Public Member Functions inherited from CSGObject
	CSGObject ()
	CSGObject (const CSGObject &orig)
virtual	~CSGObject ()
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="")
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 ()
SGVector< char * >	get_modelsel_names ()
char *	get_modsel_param_descr (const char *param_name)
index_t	get_modsel_param_index (const char *param_name)

Protected Attributes
std::vector< float64_t >	similarity_matrix
int32_t	num_tasks
std::vector< int32_t >	task_vector_lhs
std::vector< int32_t >	task_vector_rhs
float64_t	scale
Protected Attributes inherited from CKernelNormalizer
ENormalizerType	m_type

Additional Inherited Members
Public Attributes inherited from CSGObject
SGIO *	io
Parallel *	parallel
Version *	version
Parameter *	m_parameters
Parameter *	m_model_selection_parameters
Protected Member Functions inherited from CSGObject
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)

Constructor & Destructor Documentation

CMultitaskKernelNormalizer

(

)

default constructor

Definition at line 38 of file MultitaskKernelNormalizer.h.

CMultitaskKernelNormalizer

(

std::vector< int32_t >

task_vector

)

default constructor

Parameters

task_vector

task vector with containing task_id for each example

Definition at line 46 of file MultitaskKernelNormalizer.h.

virtual ~CMultitaskKernelNormalizer ( )

virtual

default destructor

Definition at line 61 of file MultitaskKernelNormalizer.h.

Member Function Documentation

virtual const char* get_name ( ) const

virtual

Returns

object name

Implements CSGObject.

Definition at line 228 of file MultitaskKernelNormalizer.h.

int32_t get_num_unique_tasks

(

std::vector< int32_t >

vec

)

helper routine

Parameters

vec	vector with containing task_id for each example

Returns

number of unique task ids

Definition at line 103 of file MultitaskKernelNormalizer.h.

float64_t get_task_similarity	(	int32_t	task_lhs,
		int32_t	task_rhs
	)

Parameters

task_lhs	task_id on left hand side
task_rhs	task_id on right hand side

Returns

similarity between tasks

Definition at line 201 of file MultitaskKernelNormalizer.h.

std::vector<int32_t> get_task_vector_lhs

(

)

const

Returns

vec task vector with containing task_id for each example on left hand side

Definition at line 166 of file MultitaskKernelNormalizer.h.

std::vector<int32_t> get_task_vector_rhs

(

)

const

Returns

vec task vector with containing task_id for each example on right hand side

Definition at line 178 of file MultitaskKernelNormalizer.h.

virtual bool init ( CKernel *  k )

virtual

initialization of the normalizer

Parameters

k

kernel

Implements CKernelNormalizer.

Definition at line 67 of file MultitaskKernelNormalizer.h.

CMultitaskKernelNormalizer* KernelNormalizerToMultitaskKernelNormalizer

(

CKernelNormalizer *

n

)

convert generic kernel normalizer object into CMultitaskKernelNormalizer

Returns

converted CMultitaskKernelNormalizer object

Definition at line 237 of file MultitaskKernelNormalizer.h.

virtual float64_t normalize ( float64_t  value, int32_t  idx_lhs, int32_t  idx_rhs  )

virtual

normalize the kernel value

Parameters

value	kernel value
idx_lhs	index of left hand side vector
idx_rhs	index of right hand side vector

Implements CKernelNormalizer.

Definition at line 123 of file MultitaskKernelNormalizer.h.

virtual float64_t normalize_lhs ( float64_t  value, int32_t  idx_lhs  )

virtual

normalize only the left hand side vector

Parameters

value	value of a component of the left hand side feature vector
idx_lhs	index of left hand side vector

Implements CKernelNormalizer.

Definition at line 147 of file MultitaskKernelNormalizer.h.

virtual float64_t normalize_rhs ( float64_t  value, int32_t  idx_rhs  )

virtual

normalize only the right hand side vector

Parameters

value	value of a component of the right hand side feature vector
idx_rhs	index of right hand side vector

Implements CKernelNormalizer.

Definition at line 157 of file MultitaskKernelNormalizer.h.

void set_task_similarity	(	int32_t	task_lhs,
		int32_t	task_rhs,
		float64_t	similarity
	)

Parameters

task_lhs	task_id on left hand side
task_rhs	task_id on right hand side
similarity	similarity between tasks

Definition at line 216 of file MultitaskKernelNormalizer.h.

void set_task_vector

(

std::vector< int32_t >

vec

)

Parameters

vec	task vector with containing task_id for each example

Definition at line 190 of file MultitaskKernelNormalizer.h.

void set_task_vector_lhs

(

std::vector< int32_t >

vec

)

Parameters

vec	task vector with containing task_id for each example

Definition at line 172 of file MultitaskKernelNormalizer.h.

void set_task_vector_rhs

(

std::vector< int32_t >

vec

)

Parameters

vec	task vector with containing task_id for each example

Definition at line 184 of file MultitaskKernelNormalizer.h.

Member Data Documentation

int32_t num_tasks

protected

number of tasks

Definition at line 249 of file MultitaskKernelNormalizer.h.

float64_t scale

protected

scale constant obtained from k(0,0)

Definition at line 258 of file MultitaskKernelNormalizer.h.

std::vector<float64_t> similarity_matrix

protected

MxM matrix encoding similarity between tasks

Definition at line 246 of file MultitaskKernelNormalizer.h.

std::vector<int32_t> task_vector_lhs

protected

task vector indicating to which task each example on the left hand side belongs

Definition at line 252 of file MultitaskKernelNormalizer.h.

std::vector<int32_t> task_vector_rhs

protected

task vector indicating to which task each example on the right hand side belongs

Definition at line 255 of file MultitaskKernelNormalizer.h.

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

• MultitaskKernelNormalizer.h