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.
Definition at line 31 of file MultitaskKernelMaskNormalizer.h.
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 |
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
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.
std::vector<int32_t> get_active_tasks | ( | ) |
Definition at line 224 of file MultitaskKernelMaskNormalizer.h.
virtual const char* get_name | ( | void | ) | const [virtual] |
Implements CSGObject.
Definition at line 258 of file MultitaskKernelMaskNormalizer.h.
float64_t get_normalization_constant | ( | ) | const |
Definition at line 241 of file MultitaskKernelMaskNormalizer.h.
float64_t get_similarity | ( | int32_t | task_lhs, | |
int32_t | task_rhs | |||
) |
task_lhs | task_id on left hand side | |
task_rhs | task_id on right hand side |
Definition at line 204 of file MultitaskKernelMaskNormalizer.h.
std::vector<int32_t> get_task_vector_lhs | ( | ) | const |
Definition at line 151 of file MultitaskKernelMaskNormalizer.h.
std::vector<int32_t> get_task_vector_rhs | ( | ) | const |
Definition at line 172 of file MultitaskKernelMaskNormalizer.h.
virtual bool init | ( | CKernel * | k | ) | [virtual] |
initialization of the normalizer
k | kernel |
Implements CKernelNormalizer.
Definition at line 75 of file MultitaskKernelMaskNormalizer.h.
normalize the kernel value
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.
normalize only the left hand side vector
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.
normalize only the right hand side vector
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.
constant | normalization constant |
Definition at line 249 of file MultitaskKernelMaskNormalizer.h.
void set_task_vector | ( | std::vector< int32_t > | vec | ) |
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 | ) |
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 | ) |
vec | task vector with containing task_id for each example |
Definition at line 179 of file MultitaskKernelMaskNormalizer.h.
std::set<int32_t> active_tasks [protected] |
list of active tasks
Definition at line 268 of file MultitaskKernelMaskNormalizer.h.
float64_t normalization_constant [protected] |
outer normalization constant
Definition at line 280 of file MultitaskKernelMaskNormalizer.h.
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.