get_support_vector_class_svmT_get_support_vector_class_svmGetSupportVectorClassSvmGetSupportVectorClassSvm (Operator)

Name

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

Signature

Description

The operator get_support_vector_class_svmget_support_vector_class_svmGetSupportVectorClassSvmGetSupportVectorClassSvmGetSupportVectorClassSvm maps support vectors of a trained SVM (given in SVMHandleSVMHandleSVMHandleSVMHandleSVMHandle) to the original training data set. The index of the SV is specified with IndexSupportVectorIndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVector. The index is counted from 0, i.e., IndexSupportVectorIndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVector must be a number between 0 and IndexSupportVectors - 1, where IndexSupportVectors can be determined with get_support_vector_num_class_svmget_support_vector_num_class_svmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvm. The index of this SV in the training data is returned in IndexIndexIndexIndexindex. This IndexIndexIndexIndexindex can be used for a query with get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmGetSampleClassSvm to obtain the feature vectors that become support vectors. get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmGetSampleClassSvm can, for example, be used to visualize the support vectors.

Note that when using train_class_svmtrain_class_svmTrainClassSvmTrainClassSvmTrainClassSvm with a mode different from 'default' or reducing the SVM with reduce_class_svmreduce_class_svmReduceClassSvmReduceClassSvmReduceClassSvm, the returned IndexIndexIndexIndexindex 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

Result

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

Possible Predecessors

train_class_svmtrain_class_svmTrainClassSvmTrainClassSvmTrainClassSvm, get_support_vector_num_class_svmget_support_vector_num_class_svmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvm

Possible Successors

get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmGetSampleClassSvm

See also

create_class_svmcreate_class_svmCreateClassSvmCreateClassSvmCreateClassSvm

Module

Foundation