Public Member Functions | Protected Attributes

CMultitaskKernelMaskNormalizer Class Reference


Detailed Description

The MultitaskKernel allows Multitask Learning via a modified kernel function.

The user defines a set of active tasks. Subsequently, only similarities between active tasks are taken into account. Kernel entries between tasks of which at least one is not an active tasks are set to zero.

\[ K_S(x,y)=\left\{\begin{array}{cl} K_B(x,y), & \mbox{if } t(x) \in S \wedge t(y) \in S\\ 0, & \mbox{else} \end{array}\right. \]

Definition at line 31 of file MultitaskKernelMaskNormalizer.h.

Inheritance diagram for CMultitaskKernelMaskNormalizer:
Inheritance graph
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List of all members.

Public Member Functions

 CMultitaskKernelMaskNormalizer ()
 CMultitaskKernelMaskNormalizer (std::vector< int32_t > task_lhs, std::vector< int32_t > task_rhs, std::vector< int32_t > active_tasks_vec)
virtual ~CMultitaskKernelMaskNormalizer ()
virtual bool init (CKernel *k)
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_similarity (int32_t task_lhs, int32_t task_rhs)
std::vector< int32_t > get_active_tasks ()
float64_t get_normalization_constant () const
float64_t set_normalization_constant (float64_t constant)
virtual const char * get_name () const

Protected Attributes

std::set< int32_t > active_tasks
std::vector< int32_t > task_vector_lhs
std::vector< int32_t > task_vector_rhs
float64_t scale
float64_t normalization_constant

Constructor & Destructor Documentation

default constructor

Definition at line 38 of file MultitaskKernelMaskNormalizer.h.

CMultitaskKernelMaskNormalizer ( std::vector< int32_t >  task_lhs,
std::vector< int32_t >  task_rhs,
std::vector< int32_t >  active_tasks_vec 
)

default constructor

Parameters:
task_lhs task vector with containing task_id for each example for left hand side
task_rhs task vector with containing task_id for each example for right hand side
active_tasks_vec 

Definition at line 49 of file MultitaskKernelMaskNormalizer.h.

virtual ~CMultitaskKernelMaskNormalizer (  )  [virtual]

default destructor

Definition at line 69 of file MultitaskKernelMaskNormalizer.h.


Member Function Documentation

std::vector<int32_t> get_active_tasks (  ) 
Returns:
list of active task ids

Definition at line 224 of file MultitaskKernelMaskNormalizer.h.

virtual const char* get_name ( void   )  const [virtual]
Returns:
object name

Implements CSGObject.

Definition at line 258 of file MultitaskKernelMaskNormalizer.h.

float64_t get_normalization_constant (  )  const
Returns:
normalization constant

Definition at line 241 of file MultitaskKernelMaskNormalizer.h.

float64_t get_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 204 of file MultitaskKernelMaskNormalizer.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 151 of file MultitaskKernelMaskNormalizer.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 172 of file MultitaskKernelMaskNormalizer.h.

virtual bool init ( CKernel k  )  [virtual]

initialization of the normalizer

Parameters:
k kernel

Implements CKernelNormalizer.

Definition at line 75 of file MultitaskKernelMaskNormalizer.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 112 of file MultitaskKernelMaskNormalizer.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 134 of file MultitaskKernelMaskNormalizer.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 144 of file MultitaskKernelMaskNormalizer.h.

float64_t set_normalization_constant ( float64_t  constant  ) 
Parameters:
constant normalization constant

Definition at line 249 of file MultitaskKernelMaskNormalizer.h.

void set_task_vector ( std::vector< int32_t >  vec  ) 
Parameters:
vec task vector with containing task_id for each example

Definition at line 192 of file MultitaskKernelMaskNormalizer.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 158 of file MultitaskKernelMaskNormalizer.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 179 of file MultitaskKernelMaskNormalizer.h.


Member Data Documentation

std::set<int32_t> active_tasks [protected]

list of active tasks

Definition at line 268 of file MultitaskKernelMaskNormalizer.h.

outer normalization constant

Definition at line 280 of file MultitaskKernelMaskNormalizer.h.

float64_t scale [protected]

value of first element

Definition at line 277 of file MultitaskKernelMaskNormalizer.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 271 of file MultitaskKernelMaskNormalizer.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 274 of file MultitaskKernelMaskNormalizer.h.


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