Operator Reference

HALCON Operator Reference / Classification / Support Vector Machines

• HDevelop
• .NET
• Python
• C++
• C

ClassesClasses | | Operators

get_support_vector_class_svmT_get_support_vector_class_svmGetSupportVectorClassSvmGetSupportVectorClassSvmget_support_vector_class_svm (Operator)

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)

Herror T_get_support_vector_class_svm(const Htuple SVMHandle, const Htuple IndexSupportVector, Htuple* Index)

void GetSupportVectorClassSvm(const HTuple& SVMHandle, const HTuple& IndexSupportVector, HTuple* Index)

double HClassSvm::GetSupportVectorClassSvm(Hlong IndexSupportVector) const

static void HOperatorSet.GetSupportVectorClassSvm(HTuple SVMHandle, HTuple indexSupportVector, out HTuple index)

double HClassSvm.GetSupportVectorClassSvm(int indexSupportVector)

def get_support_vector_class_svm(svmhandle: HHandle, index_support_vector: int) -> float

Description

The operator get_support_vector_class_svmget_support_vector_class_svmGetSupportVectorClassSvmGetSupportVectorClassSvmget_support_vector_class_svm maps a support vector of a trained SVM (given in SVMHandleSVMHandleSVMHandleSVMHandlesvmhandle) to the original training data set. The index of the SV is specified with IndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVectorindex_support_vector. The index is counted from 0, i.e., IndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVectorindex_support_vector must be a number between 0 and NumSupportVectorsNumSupportVectorsNumSupportVectorsnumSupportVectorsnum_support_vectors - 1, where NumSupportVectorsNumSupportVectorsNumSupportVectorsnumSupportVectorsnum_support_vectors can be determined with get_support_vector_num_class_svmget_support_vector_num_class_svmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmget_support_vector_num_class_svm. 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_svmGetSampleClassSvmGetSampleClassSvmget_sample_class_svm to obtain the feature vectors that become support vectors. get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmget_sample_class_svm can, for example, be used to visualize the support vectors.

Note that when using train_class_svmtrain_class_svmTrainClassSvmTrainClassSvmtrain_class_svm with a mode different from 'default'"default""default""default""default" or reducing the SVM with reduce_class_svmreduce_class_svmReduceClassSvmReduceClassSvmreduce_class_svm, 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

SVMHandleSVMHandleSVMHandleSVMHandlesvmhandle (input_control)  class_svm → HClassSvm, HTupleHHandleHTupleHtuple (handle) (IntPtr) (HHandle) (handle)

SVM handle.

IndexSupportVectorIndexSupportVectorIndexSupportVectorindexSupportVectorindex_support_vector (input_control)  integer → HTupleintHTupleHtuple (integer) (int / long) (Hlong) (Hlong)

Index of the stored support vector.

IndexIndexIndexindexindex (output_control)  real → HTuplefloatHTupleHtuple (real) (double) (double) (double)

Index of the support vector in the training set.

Result

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

Possible Predecessors

train_class_svmtrain_class_svmTrainClassSvmTrainClassSvmtrain_class_svm, get_support_vector_num_class_svmget_support_vector_num_class_svmGetSupportVectorNumClassSvmGetSupportVectorNumClassSvmget_support_vector_num_class_svm

Possible Successors

get_sample_class_svmget_sample_class_svmGetSampleClassSvmGetSampleClassSvmget_sample_class_svm

See also

create_class_svmcreate_class_svmCreateClassSvmCreateClassSvmcreate_class_svm

Module

Foundation

---

ClassesClasses | | Operators