Computes the standard linear kernel on sparse real valued features.
Formally, it computes
Definition at line 29 of file SparseLinearKernel.h.
Public Member Functions | |
CSparseLinearKernel () | |
CSparseLinearKernel (CSparseFeatures< float64_t > *l, CSparseFeatures< float64_t > *r) | |
virtual | ~CSparseLinearKernel () |
virtual bool | init (CFeatures *l, CFeatures *r) |
virtual void | cleanup () |
virtual EKernelType | get_kernel_type () |
virtual const char * | get_name () const |
virtual bool | init_optimization (int32_t num_suppvec, int32_t *sv_idx, float64_t *alphas) |
virtual bool | delete_optimization () |
virtual float64_t | compute_optimized (int32_t idx) |
virtual void | clear_normal () |
virtual void | add_to_normal (int32_t idx, float64_t weight) |
const float64_t * | get_normal (int32_t &len) |
Protected Member Functions | |
virtual float64_t | compute (int32_t idx_a, int32_t idx_b) |
Protected Attributes | |
float64_t * | normal |
int32_t | normal_length |
constructor
Definition at line 20 of file SparseLinearKernel.cpp.
CSparseLinearKernel | ( | CSparseFeatures< float64_t > * | l, | |
CSparseFeatures< float64_t > * | r | |||
) |
constructor
l | features of left-hand side | |
r | features of right-hand side |
Definition at line 26 of file SparseLinearKernel.cpp.
~CSparseLinearKernel | ( | ) | [virtual] |
Definition at line 34 of file SparseLinearKernel.cpp.
void add_to_normal | ( | int32_t | idx, | |
float64_t | weight | |||
) | [virtual] |
add to normal
idx | where to add | |
weight | what to add |
Reimplemented from CKernel.
Definition at line 65 of file SparseLinearKernel.cpp.
void cleanup | ( | ) | [virtual] |
void clear_normal | ( | ) | [virtual] |
float64_t compute | ( | int32_t | idx_a, | |
int32_t | idx_b | |||
) | [protected, virtual] |
compute kernel function for features a and b idx_{a,b} denote the index of the feature vectors in the corresponding feature object
idx_a | index a | |
idx_b | index b |
Implements CKernel.
Definition at line 72 of file SparseLinearKernel.cpp.
float64_t compute_optimized | ( | int32_t | idx | ) | [virtual] |
compute optimized
idx | index to compute |
Reimplemented from CKernel.
Definition at line 115 of file SparseLinearKernel.cpp.
bool delete_optimization | ( | ) | [virtual] |
delete optimization
Reimplemented from CKernel.
Definition at line 105 of file SparseLinearKernel.cpp.
virtual EKernelType get_kernel_type | ( | ) | [virtual] |
return what type of kernel we are
Implements CKernel.
Definition at line 61 of file SparseLinearKernel.h.
virtual const char* get_name | ( | ) | const [virtual] |
return the kernel's name
Implements CSGObject.
Definition at line 67 of file SparseLinearKernel.h.
const float64_t* get_normal | ( | int32_t & | len | ) |
get normal
len | length of normal vector will be stored here |
Definition at line 108 of file SparseLinearKernel.h.
initialize kernel
l | features of left-hand side | |
r | features of right-hand side |
Reimplemented from CSparseKernel< float64_t >.
Definition at line 39 of file SparseLinearKernel.cpp.
bool init_optimization | ( | int32_t | num_suppvec, | |
int32_t * | sv_idx, | |||
float64_t * | alphas | |||
) | [virtual] |
optimizable kernel, i.e. precompute normal vector and as phi(x) = x do scalar product in input space
num_suppvec | number of support vectors | |
sv_idx | support vector index | |
alphas | alphas |
Reimplemented from CKernel.
Definition at line 93 of file SparseLinearKernel.cpp.
normal vector (used in case of optimized kernel)
Definition at line 127 of file SparseLinearKernel.h.
int32_t normal_length [protected] |
length of normal vector
Definition at line 129 of file SparseLinearKernel.h.