CMultitaskKernelNormalizer Class Reference

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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:

List of all members.

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
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

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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.

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Member Function Documentation

virtual const char* get_name

(

void

)

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.

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.

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Member Data Documentation

int32_t num_tasks [protected]

number of tasks

Definition at line 239 of file MultitaskKernelNormalizer.h.

float64_t scale [protected]

scale constant obtained from k(0,0)

Definition at line 248 of file MultitaskKernelNormalizer.h.

std::vector<float64_t> similarity_matrix [protected]

MxM matrix encoding similarity between tasks

Definition at line 236 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 242 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 245 of file MultitaskKernelNormalizer.h.

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

• MultitaskKernelNormalizer.h