get_support_vector_class_svmT_get_support_vector_class_svmGetSupportVectorClassSvmGetSupportVectorClassSvmget_support_vector_class_svm (Operator)

Name

get_support_vector_class_svmT_get_support_vector_class_svmGetSupportVectorClassSvmGetSupportVectorClassSvmget_support_vector_class_svm — Return the index of a support vector from a trained support vector machine.

Signature

get_support_vector_class_svm( : : SVMHandle, IndexSupportVector : Index)

Description

The operator get_support_vector_class_svmget_support_vector_class_svmGetSupportVectorClassSvmGetSupportVectorClassSvmGetSupportVectorClassSvmget_support_vector_class_svm maps a support vector of a trained SVM (given in SVMHandleSVMHandleSVMHandleSVMHandleSVMHandlesvmhandle) to the original training data set. The index of the SV is specified with IndexSupportVectorIndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVectorindex_support_vector. The index is counted from 0, i.e., IndexSupportVectorIndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVectorindex_support_vector must be a number between 0 and NumSupportVectorsNumSupportVectorsNumSupportVectorsNumSupportVectorsnumSupportVectorsnum_support_vectors - 1, where NumSupportVectorsNumSupportVectorsNumSupportVectorsNumSupportVectorsnumSupportVectorsnum_support_vectors can be determined with get_support_vector_num_class_svmget_support_vector_num_class_svmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmget_support_vector_num_class_svm. The index of this SV in the training data is returned in IndexIndexIndexIndexindexindex. This IndexIndexIndexIndexindexindex can be used for a query with get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmGetSampleClassSvmget_sample_class_svm to obtain the feature vectors that become support vectors. get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmGetSampleClassSvmget_sample_class_svm can, for example, be used to visualize the support vectors.

Note that when using train_class_svmtrain_class_svmTrainClassSvmTrainClassSvmTrainClassSvmtrain_class_svm with a mode different from 'default'"default""default""default""default""default" or reducing the SVM with reduce_class_svmreduce_class_svmReduceClassSvmReduceClassSvmReduceClassSvmreduce_class_svm, the returned IndexIndexIndexIndexindexindex will always be -1, i.e., it will be invalid. The reason for this is that a consistent mapping between SV and training data becomes impossible.

Execution Information

Multithreading type: reentrant (runs in parallel with non-exclusive operators).
Multithreading scope: global (may be called from any thread).
Processed without parallelization.

Parameters

SVMHandleSVMHandleSVMHandleSVMHandleSVMHandlesvmhandle (input_control) class_svm → (handle)

SVM handle.

IndexSupportVectorIndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVectorindex_support_vector (input_control) integer → (integer)

Index of the stored support vector.

IndexIndexIndexIndexindexindex (output_control) real → (real)

Index of the support vector in the training set.

Result

If the parameters are valid the operator get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmGetSampleClassSvmget_sample_class_svm returns the value 2 ( H_MSG_TRUE) . If necessary, an exception is raised.

Possible Predecessors

train_class_svmtrain_class_svmTrainClassSvmTrainClassSvmTrainClassSvmtrain_class_svm, get_support_vector_num_class_svmget_support_vector_num_class_svmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmget_support_vector_num_class_svm

Possible Successors

get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmGetSampleClassSvmget_sample_class_svm

Module

Foundation

Operators