Preprocessor PruneVarSubMean will substract the mean and remove features that have zero variance.
It will optionally normalize standard deviation of features to 1 (by dividing by standard deviation of the feature)
Definition at line 30 of file PruneVarSubMean.h.
Public Member Functions | |
| CPruneVarSubMean (bool divide=true) | |
| virtual | ~CPruneVarSubMean () |
| virtual bool | init (CFeatures *features) |
| initialize preprocessor from features | |
| virtual void | cleanup () |
| cleanup | |
| virtual SGMatrix< float64_t > | apply_to_feature_matrix (CFeatures *features) |
| virtual SGVector< float64_t > | apply_to_feature_vector (SGVector< float64_t > vector) |
| virtual const char * | get_name () const |
| virtual EPreprocessorType | get_type () const |
| return a type of preprocessor | |
Protected Attributes | |
| int32_t * | idx |
| float64_t * | mean |
| float64_t * | std |
| int32_t | num_idx |
| bool | divide_by_std |
| bool | initialized |
| true when already initialized | |
| CPruneVarSubMean | ( | bool | divide = true |
) |
constructor
| divide | if division shall be made |
Definition at line 21 of file PruneVarSubMean.cpp.
| ~CPruneVarSubMean | ( | ) | [virtual] |
destructor
Definition at line 27 of file PruneVarSubMean.cpp.
apply preproc on feature matrix result in feature matrix return pointer to feature_matrix, i.e. f->get_feature_matrix();
Implements CSimplePreprocessor< float64_t >.
Definition at line 134 of file PruneVarSubMean.cpp.
apply preproc on single feature vector result in feature matrix
Implements CSimplePreprocessor< float64_t >.
Definition at line 170 of file PruneVarSubMean.cpp.
| void cleanup | ( | ) | [virtual] |
cleanup
clean up allocated memory
Implements CPreprocessor.
Definition at line 121 of file PruneVarSubMean.cpp.
| virtual const char* get_name | ( | void | ) | const [virtual] |
| virtual EPreprocessorType get_type | ( | ) | const [virtual] |
return a type of preprocessor
Reimplemented from CSimplePreprocessor< float64_t >.
Definition at line 61 of file PruneVarSubMean.h.
| bool init | ( | CFeatures * | features | ) | [virtual] |
initialize preprocessor from features
Implements CPreprocessor.
Definition at line 33 of file PruneVarSubMean.cpp.
bool divide_by_std [protected] |
divide by std
Definition at line 73 of file PruneVarSubMean.h.
int32_t* idx [protected] |
idx
Definition at line 65 of file PruneVarSubMean.h.
bool initialized [protected] |
true when already initialized
Definition at line 76 of file PruneVarSubMean.h.
mean
Definition at line 67 of file PruneVarSubMean.h.
int32_t num_idx [protected] |
num idx
Definition at line 71 of file PruneVarSubMean.h.
std
Definition at line 69 of file PruneVarSubMean.h.
