CAUCKernel Class Reference
Detailed Description
The AUC kernel can be used to maximize the area under the receiver operator characteristic curve (AUC) instead of margin in SVM training.
It takes as argument a sub-kernel and Labels based on which number of positive labels times number of negative labels many ``virtual'' examples are created that ensure that all positive examples get a higher score than all negative examples in training.
Definition at line 28 of file AUCKernel.h.
Public Member Functions | |
| CAUCKernel (int32_t size, CKernel *subkernel) | |
| virtual | ~CAUCKernel () |
| CLabels * | setup_auc_maximization (CLabels *labels) |
| virtual bool | init (CFeatures *l, CFeatures *r) |
| virtual bool | load_init (FILE *src) |
| virtual bool | save_init (FILE *dest) |
| virtual EKernelType | get_kernel_type () |
| virtual const char * | get_name () const |
Protected Member Functions | |
| virtual float64_t | compute (int32_t idx_a, int32_t idx_b) |
Protected Attributes | |
| CKernel * | subkernel |
Constructor & Destructor Documentation
| CAUCKernel::CAUCKernel | ( | int32_t | size, | |
| CKernel * | subkernel | |||
| ) |
constructor
- Parameters:
-
size cache size subkernel the subkernel
Definition at line 18 of file AUCKernel.cpp.
| CAUCKernel::~CAUCKernel | ( | ) | [virtual] |
destructor
Definition at line 24 of file AUCKernel.cpp.
Member Function Documentation
| float64_t CAUCKernel::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
- Parameters:
-
idx_a index a idx_b index b
- Returns:
- computed kernel function at indices a,b
Implements CKernel.
Definition at line 127 of file AUCKernel.cpp.
| virtual EKernelType CAUCKernel::get_kernel_type | ( | ) | [virtual] |
return what type of kernel we are
- Returns:
- kernel type AUC
Implements CKernel.
Definition at line 75 of file AUCKernel.h.
| virtual const char* CAUCKernel::get_name | ( | ) | const [virtual] |
return the kernel's name
- Returns:
- name AUC
Implements CSGObject.
Definition at line 81 of file AUCKernel.h.
initialize kernel
- Parameters:
-
l features of left-hand side r features of right-hand side
- Returns:
- if initializing was successful
Reimplemented from CSimpleKernel< uint16_t >.
Definition at line 110 of file AUCKernel.cpp.
| bool CAUCKernel::load_init | ( | FILE * | src | ) | [virtual] |
load kernel init_data
- Parameters:
-
src file to load from
- Returns:
- if loading was successful
Implements CKernel.
Definition at line 117 of file AUCKernel.cpp.
| bool CAUCKernel::save_init | ( | FILE * | dest | ) | [virtual] |
save kernel init_data
- Parameters:
-
dest file to save to
- Returns:
- if saving was successful
Implements CKernel.
Definition at line 122 of file AUCKernel.cpp.
initialize kernel based on current labeling and subkernel
- Parameters:
-
labels - current labeling
- Returns:
- new label object to be used together with this kernel in SVM training for AUC maximization
Definition at line 30 of file AUCKernel.cpp.
Member Data Documentation
CKernel* CAUCKernel::subkernel [protected] |
the subkernel
Definition at line 96 of file AUCKernel.h.
The documentation for this class was generated from the following files: