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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)

\[ k'({\bf x},{\bf x'}) = \gamma(task({\bf x}),task({\bf x'})) k({\bf x},{\bf x'}) \]

Definition at line 31 of file MultitaskKernelNormalizer.h.

Inheritance diagram for CMultitaskKernelNormalizer:
Inheritance graph
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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
CMultitaskKernelNormalizerKernelNormalizerToMultitaskKernelNormalizer (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)
SGIOget_global_io ()
void set_global_parallel (Parallel *parallel)
Parallelget_global_parallel ()
void set_global_version (Version *version)
Versionget_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_tsimilarity_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
SGIOio
Parallelparallel
Versionversion
Parameterm_parameters
Parameterm_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

default constructor

Definition at line 38 of file MultitaskKernelNormalizer.h.

CMultitaskKernelNormalizer ( std::vector< int32_t >  task_vector)

default constructor

Parameters
task_vectortask 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
vecvector 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_lhstask_id on left hand side
task_rhstask_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
kkernel

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
valuekernel value
idx_lhsindex of left hand side vector
idx_rhsindex 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
valuevalue of a component of the left hand side feature vector
idx_lhsindex 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
valuevalue of a component of the right hand side feature vector
idx_rhsindex 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_lhstask_id on left hand side
task_rhstask_id on right hand side
similaritysimilarity between tasks

Definition at line 216 of file MultitaskKernelNormalizer.h.

void set_task_vector ( std::vector< int32_t >  vec)
Parameters
vectask 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
vectask 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
vectask 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.


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

SHOGUN Machine Learning Toolbox - Documentation