Class CKernelDependenceMaximization, that uses an implementation of CKernelIndependenceTest to compute dependence measures for feature selection. Different kernels are used for labels and data. For the sake of computational convenience, the precompute() method is overridden to precompute the kernel for labels and save as an instance of CCustomKernel.
在文件 KernelDependenceMaximization.h 第 49 行定义.
Public 属性 | |
SGIO * | io |
Parallel * | parallel |
Version * | version |
Parameter * | m_parameters |
Parameter * | m_model_selection_parameters |
Parameter * | m_gradient_parameters |
ParameterMap * | m_parameter_map |
uint32_t | m_hash |
Protected 成员函数 | |
virtual void | precompute () |
virtual CFeatures * | create_transformed_copy (CFeatures *features, index_t idx) |
virtual CFeatures * | apply_backward_elimination (CFeatures *features) |
virtual void | adapt_params (CFeatures *features) |
index_t | get_num_features (CFeatures *features) const |
virtual TParameter * | migrate (DynArray< TParameter * > *param_base, const SGParamInfo *target) |
virtual void | one_to_one_migration_prepare (DynArray< TParameter * > *param_base, const SGParamInfo *target, TParameter *&replacement, TParameter *&to_migrate, char *old_name=NULL) |
virtual void | load_serializable_pre () throw (ShogunException) |
virtual void | load_serializable_post () throw (ShogunException) |
virtual void | save_serializable_pre () throw (ShogunException) |
virtual void | save_serializable_post () throw (ShogunException) |
Default constructor
在文件 KernelDependenceMaximization.cpp 第 37 行定义.
|
virtual |
Destructor
在文件 KernelDependenceMaximization.cpp 第 54 行定义.
|
protectedvirtualinherited |
Tunes the parameters which are required to compute the measure based on current features. Overridden in the subclasses. Here it does nothing.
features | the features based on which parameters are needed to be tuned for computing measures |
Generic interface for applying the feature selection preprocessor. Acts as a wrapper which decides which actual method to call based on the algorithm specified.
features | the input features |
实现了 CPreprocessor.
Applies backward elimination algorithm for performing feature selection. After performing necessary precomputing (defined by subclasses), it iteratively eliminates a number of features based on a measure until target dimension is reached.
features | the input features |
|
inherited |
Builds a dictionary of all parameters in SGObject as well of those of SGObjects that are parameters of this object. Dictionary maps parameters to the objects that own them.
dict | dictionary of parameters to be built. |
在文件 SGObject.cpp 第 1243 行定义.
|
virtualinherited |
performs cleanup
实现了 CPreprocessor.
|
virtualinherited |
Creates a clone of the current object. This is done via recursively traversing all parameters, which corresponds to a deep copy. Calling equals on the cloned object always returns true although none of the memory of both objects overlaps.
在文件 SGObject.cpp 第 1360 行定义.
Method that computes the measures using test statistic computed by an instance of CIndependenceTest wiht the provided features and the labels
features | the features on which the measure has to be computed |
idx | the index that decides which features should we compute the measure on |
实现了 CFeatureSelection< float64_t >.
在文件 DependenceMaximization.cpp 第 105 行定义.
Helper method which removes the dimension specified via the index. It copies the rest of the features into a separate object via copy_dimension_subset() call.
features | the features |
idx | index of the dimension which is required to be removed |
在文件 DependenceMaximization.cpp 第 77 行定义.
|
virtualinherited |
A deep copy. All the instance variables will also be copied.
在文件 SGObject.cpp 第 200 行定义.
Recursively compares the current SGObject to another one. Compares all registered numerical parameters, recursion upon complex (SGObject) parameters. Does not compare pointers!
May be overwritten but please do with care! Should not be necessary in most cases.
other | object to compare with |
accuracy | accuracy to use for comparison (optional) |
tolerant | allows linient check on float equality (within accuracy) |
在文件 SGObject.cpp 第 1264 行定义.
|
inherited |
|
virtualinherited |
实现了 CPreprocessor.
|
virtualinherited |
实现了 CPreprocessor.
|
inherited |
|
inherited |
|
inherited |
CKernel * get_kernel_features | ( | ) | const |
在文件 KernelDependenceMaximization.cpp 第 131 行定义.
CKernel * get_kernel_labels | ( | ) | const |
在文件 KernelDependenceMaximization.cpp 第 137 行定义.
|
inherited |
|
inherited |
在文件 SGObject.cpp 第 1135 行定义.
|
inherited |
Returns description of a given parameter string, if it exists. SG_ERROR otherwise
param_name | name of the parameter |
在文件 SGObject.cpp 第 1159 行定义.
|
inherited |
Returns index of model selection parameter with provided index
param_name | name of model selection parameter |
在文件 SGObject.cpp 第 1172 行定义.
|
virtual |
Returns the number of features of the provided feature object. Since the number of features doesn't make sense for all types of features, this helper method checks whether obtaining a num_features is possible and then calls get_num_features() on those features after proper type-cast
features | the feature object |
|
inherited |
|
inherited |
|
inherited |
|
virtualinherited |
|
virtualinherited |
Initialize preprocessor from features
features | the features |
实现了 CPreprocessor.
在文件 DependenceMaximization.cpp 第 62 行定义.
|
virtualinherited |
If the SGSerializable is a class template then TRUE will be returned and GENERIC is set to the type of the generic.
generic | set to the type of the generic if returning TRUE |
在文件 SGObject.cpp 第 297 行定义.
|
inherited |
maps all parameters of this instance to the provided file version and loads all parameter data from the file into an array, which is sorted (basically calls load_file_parameter(...) for all parameters and puts all results into a sorted array)
file_version | parameter version of the file |
current_version | version from which mapping begins (you want to use Version::get_version_parameter() for this in most cases) |
file | file to load from |
prefix | prefix for members |
在文件 SGObject.cpp 第 704 行定义.
|
inherited |
loads some specified parameters from a file with a specified version The provided parameter info has a version which is recursively mapped until the file parameter version is reached. Note that there may be possibly multiple parameters in the mapping, therefore, a set of TParameter instances is returned
param_info | information of parameter |
file_version | parameter version of the file, must be <= provided parameter version |
file | file to load from |
prefix | prefix for members |
在文件 SGObject.cpp 第 545 行定义.
|
virtualinherited |
Load this object from file. If it will fail (returning FALSE) then this object will contain inconsistent data and should not be used!
file | where to load from |
prefix | prefix for members |
param_version | (optional) a parameter version different to (this is mainly for testing, better do not use) |
在文件 SGObject.cpp 第 374 行定义.
|
protectedvirtualinherited |
Can (optionally) be overridden to post-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::LOAD_SERIALIZABLE_POST is called.
ShogunException | will be thrown if an error occurs. |
被 CKernel, CWeightedDegreePositionStringKernel, CList, CAlphabet, CLinearHMM, CGaussianKernel, CInverseMultiQuadricKernel, CCircularKernel , 以及 CExponentialKernel 重载.
在文件 SGObject.cpp 第 1062 行定义.
|
protectedvirtualinherited |
Can (optionally) be overridden to pre-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::LOAD_SERIALIZABLE_PRE is called.
ShogunException | will be thrown if an error occurs. |
被 CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool > , 以及 CDynamicObjectArray 重载.
在文件 SGObject.cpp 第 1057 行定义.
|
inherited |
Takes a set of TParameter instances (base) with a certain version and a set of target parameter infos and recursively maps the base level wise to the current version using CSGObject::migrate(...). The base is replaced. After this call, the base version containing parameters should be of same version/type as the initial target parameter infos. Note for this to work, the migrate methods and all the internal parameter mappings have to match
param_base | set of TParameter instances that are mapped to the provided target parameter infos |
base_version | version of the parameter base |
target_param_infos | set of SGParamInfo instances that specify the target parameter base |
在文件 SGObject.cpp 第 742 行定义.
|
protectedvirtualinherited |
creates a new TParameter instance, which contains migrated data from the version that is provided. The provided parameter data base is used for migration, this base is a collection of all parameter data of the previous version. Migration is done FROM the data in param_base TO the provided param info Migration is always one version step. Method has to be implemented in subclasses, if no match is found, base method has to be called.
If there is an element in the param_base which equals the target, a copy of the element is returned. This represents the case when nothing has changed and therefore, the migrate method is not overloaded in a subclass
param_base | set of TParameter instances to use for migration |
target | parameter info for the resulting TParameter |
在文件 SGObject.cpp 第 949 行定义.
|
protectedvirtualinherited |
This method prepares everything for a one-to-one parameter migration. One to one here means that only ONE element of the parameter base is needed for the migration (the one with the same name as the target). Data is allocated for the target (in the type as provided in the target SGParamInfo), and a corresponding new TParameter instance is written to replacement. The to_migrate pointer points to the single needed TParameter instance needed for migration. If a name change happened, the old name may be specified by old_name. In addition, the m_delete_data flag of to_migrate is set to true. So if you want to migrate data, the only thing to do after this call is converting the data in the m_parameter fields. If unsure how to use - have a look into an example for this. (base_migration_type_conversion.cpp for example)
param_base | set of TParameter instances to use for migration |
target | parameter info for the resulting TParameter |
replacement | (used as output) here the TParameter instance which is returned by migration is created into |
to_migrate | the only source that is used for migration |
old_name | with this parameter, a name change may be specified |
在文件 SGObject.cpp 第 889 行定义.
|
virtualinherited |
在文件 SGObject.cpp 第 263 行定义.
|
protectedvirtual |
Precomputes the kernel on labels and replaces the m_kernel_labels with an instance of CCustomKernel. Labels features are set via CDependenceMaximization::set_labels call.
重载 CFeatureSelection< float64_t > .
在文件 KernelDependenceMaximization.cpp 第 60 行定义.
|
inherited |
prints all parameter registered for model selection and their type
在文件 SGObject.cpp 第 1111 行定义.
|
virtualinherited |
Method which handles the removal of features based on removal policy. see documentation of CFeatureSelection. For dependence maximization approach, the highest scoring features are removed. Therefore, only m_policy can only be shogun::N_LARGEST, shogun::PERCENTILE_LARGEST. See set_policy() method for specifying the exact policy
features | the features object from which specific features has to be removed |
ranks | the ranks of the features based on their measures, 0 being the lowest rank which corresponds to smallest measure. |
实现了 CFeatureSelection< float64_t >.
在文件 DependenceMaximization.cpp 第 129 行定义.
|
virtualinherited |
Save this object to file.
file | where to save the object; will be closed during returning if PREFIX is an empty string. |
prefix | prefix for members |
param_version | (optional) a parameter version different to (this is mainly for testing, better do not use) |
在文件 SGObject.cpp 第 315 行定义.
|
protectedvirtualinherited |
Can (optionally) be overridden to post-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::SAVE_SERIALIZABLE_POST is called.
ShogunException | will be thrown if an error occurs. |
被 CKernel 重载.
在文件 SGObject.cpp 第 1072 行定义.
|
protectedvirtualinherited |
Can (optionally) be overridden to pre-initialize some member variables which are not PARAMETER::ADD'ed. Make sure that at first the overridden method BASE_CLASS::SAVE_SERIALIZABLE_PRE is called.
ShogunException | will be thrown if an error occurs. |
被 CKernel, CDynamicArray< T >, CDynamicArray< float64_t >, CDynamicArray< float32_t >, CDynamicArray< int32_t >, CDynamicArray< char >, CDynamicArray< bool > , 以及 CDynamicObjectArray 重载.
在文件 SGObject.cpp 第 1067 行定义.
|
pure virtual |
Abstract method which is overridden in the subclasses to set accepted feature selection algorithm
algorithm | the feature selection algorithm to use |
在 CBAHSIC 内被实现.
|
inherited |
在文件 SGObject.cpp 第 42 行定义.
|
inherited |
在文件 SGObject.cpp 第 47 行定义.
|
inherited |
在文件 SGObject.cpp 第 52 行定义.
|
inherited |
在文件 SGObject.cpp 第 57 行定义.
|
inherited |
在文件 SGObject.cpp 第 62 行定义.
|
inherited |
在文件 SGObject.cpp 第 67 行定义.
|
inherited |
在文件 SGObject.cpp 第 72 行定义.
|
inherited |
在文件 SGObject.cpp 第 77 行定义.
|
inherited |
在文件 SGObject.cpp 第 82 行定义.
|
inherited |
在文件 SGObject.cpp 第 87 行定义.
|
inherited |
在文件 SGObject.cpp 第 92 行定义.
|
inherited |
在文件 SGObject.cpp 第 97 行定义.
|
inherited |
在文件 SGObject.cpp 第 102 行定义.
|
inherited |
在文件 SGObject.cpp 第 107 行定义.
|
inherited |
在文件 SGObject.cpp 第 112 行定义.
|
inherited |
set generic type to T
|
inherited |
|
inherited |
|
inherited |
void set_kernel_features | ( | CKernel * | kernel | ) |
kernel | the kernel for features (data) |
在文件 KernelDependenceMaximization.cpp 第 99 行定义.
void set_kernel_labels | ( | CKernel * | kernel | ) |
kernel | the kernel for labels |
在文件 KernelDependenceMaximization.cpp 第 115 行定义.
|
virtualinherited |
Setter for labels. This method is overridden to internally convert the labels to a dense feature object and set this feature in the independence test estimator. These labels serve as samples \(\mathbf{Y}\sim q\) in the independence test
labels | the labels |
重载 CFeatureSelection< float64_t > .
在文件 DependenceMaximization.cpp 第 186 行定义.
|
inherited |
Use this method to set the number or percentile of features to be removed in each iteration.
num_remove | number or percentage of features to be removed in each iteration |
|
virtualinherited |
policy | feature removal policy |
实现了 CFeatureSelection< float64_t >.
在文件 DependenceMaximization.cpp 第 178 行定义.
|
inherited |
target_dim | the target dimension to achieve |
|
virtualinherited |
A shallow copy. All the SGObject instance variables will be simply assigned and SG_REF-ed.
被 CGaussianKernel 重载.
在文件 SGObject.cpp 第 194 行定义.
|
inherited |
unset generic type
this has to be called in classes specializing a template class
在文件 SGObject.cpp 第 304 行定义.
|
virtualinherited |
Updates the hash of current parameter combination
在文件 SGObject.cpp 第 250 行定义.
|
inherited |
io
在文件 SGObject.h 第 496 行定义.
|
protectedinherited |
Wrapper algorithm for feature selection
在文件 FeatureSelection.h 第 302 行定义.
|
protectedinherited |
The estimator for performing statistical tests for independence which is used for computing measures
在文件 DependenceMaximization.h 第 157 行定义.
|
inherited |
parameters wrt which we can compute gradients
在文件 SGObject.h 第 511 行定义.
|
inherited |
Hash of parameter values
在文件 SGObject.h 第 517 行定义.
|
protected |
The kernel for data (features) to be used in CKernelIndependenceTest
在文件 KernelDependenceMaximization.h 第 93 行定义.
|
protected |
The kernel for labels to be used in CKernelIndependenceTest
在文件 KernelDependenceMaximization.h 第 96 行定义.
|
protectedinherited |
The labels for the feature vectors
在文件 FeatureSelection.h 第 316 行定义.
|
protectedinherited |
The feature for the labels
在文件 DependenceMaximization.h 第 160 行定义.
|
inherited |
model selection parameters
在文件 SGObject.h 第 508 行定义.
|
protectedinherited |
Number or percentage of features to be removed. When the policy is set as shogun::N_SMALLEST or shogun::N_LARGEST, this number decides how many features in an iteration. For shogun::PERCENTILE_SMALLEST or shogun::PERCENTILE_LARGEST, this decides the percentage of current number of features to be removed in each iteration
在文件 FeatureSelection.h 第 313 行定义.
|
inherited |
map for different parameter versions
在文件 SGObject.h 第 514 行定义.
|
inherited |
parameters
在文件 SGObject.h 第 505 行定义.
|
protectedinherited |
Feature removal policy
在文件 FeatureSelection.h 第 305 行定义.
|
protectedinherited |
The indices of features that are selected
在文件 FeatureSelection.h 第 319 行定义.
|
protectedinherited |
Target dimension
在文件 FeatureSelection.h 第 299 行定义.
|
inherited |
parallel
在文件 SGObject.h 第 499 行定义.
|
inherited |
version
在文件 SGObject.h 第 502 行定义.