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.
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) |
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 |
default constructor
Definition at line 38 of file MultitaskKernelNormalizer.h.
CMultitaskKernelNormalizer | ( | std::vector< int32_t > | task_vector | ) |
default constructor
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.
virtual const char* get_name | ( | ) | const [virtual] |
Implements CSGObject.
Definition at line 228 of file MultitaskKernelNormalizer.h.
int32_t get_num_unique_tasks | ( | std::vector< int32_t > | vec | ) |
helper routine
vec | vector with containing task_id for each example |
Definition at line 103 of file MultitaskKernelNormalizer.h.
float64_t get_task_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 201 of file MultitaskKernelNormalizer.h.
std::vector<int32_t> get_task_vector_lhs | ( | ) | const |
Definition at line 166 of file MultitaskKernelNormalizer.h.
std::vector<int32_t> get_task_vector_rhs | ( | ) | const |
Definition at line 178 of file MultitaskKernelNormalizer.h.
virtual bool init | ( | CKernel * | k | ) | [virtual] |
initialization of the normalizer
k | kernel |
Implements CKernelNormalizer.
Definition at line 67 of file MultitaskKernelNormalizer.h.
CMultitaskKernelNormalizer* KernelNormalizerToMultitaskKernelNormalizer | ( | CKernelNormalizer * | n | ) |
convert generic kernel normalizer object into CMultitaskKernelNormalizer
Definition at line 237 of file MultitaskKernelNormalizer.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 123 of file MultitaskKernelNormalizer.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 147 of file MultitaskKernelNormalizer.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 157 of file MultitaskKernelNormalizer.h.
void set_task_similarity | ( | int32_t | task_lhs, | |
int32_t | task_rhs, | |||
float64_t | similarity | |||
) |
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 | ) |
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 | ) |
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 | ) |
vec | task vector with containing task_id for each example |
Definition at line 184 of file MultitaskKernelNormalizer.h.
int32_t num_tasks [protected] |
number of tasks
Definition at line 249 of file MultitaskKernelNormalizer.h.
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.