How to use rbf_kernel parameters with svmtrain() and svmclassify() for svm classification

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B mohan
B mohan 2012-3-28
评论： Tsalsabilla Winny Junika 2019-5-29
By using linear kernel I got the result using svmtrain() and svmclassify() function. But the result obtained is not so accurate. When I used rbf_kernel I got an error as follows. Please help me how to use parameters with example
>> load fisheriris >> data = [meas(:,1), meas(:,2)]; >> groups = ismember(species,'setosa'); >> [train, test] = crossvalind('holdOut',groups); >> cp = classperf(groups); >> svmStruct = svmtrain(data(train,:),groups(train),'showplot',true);
//Error below
>> svmStruct = svmtrain(data(train,:),groups(train),'kernel_function','1'); ??? Error using ==> svmtrain at 266 Unknown Kernel Function 1.

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回答（3 个）

Tom Lane
Tom Lane 2012-3-28
From your description, it sounds like you intended
svmStruct = svmtrain(data(train,:),groups(train),'kernel_function','rbf');
In any case, the error message simply means that '1' isn't a valid value to follow the 'kernel_function' parameter name.
  1 个评论
Yasir Mohammed
Yasir Mohammed 2016-5-30
svmStruct =svmtrain(data(train,:),groups(train),'kernel_function','rbf'); i used this but i also have the same error
Error using svmclassify (line 75) Unknown parameter name: kernel_function.
Error in SVMtest (line 14) testresult = svmclassify(svmStructSurprise,testone,'kernel_function','rbf' );
>>

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Pratik Oak
Pratik Oak 2013-3-22
Use this:
svmStruct = svmtrain(data(train,:),groups(train),'RBF_Sigma','1')
name of kernel function should be added
Farman Shah
Farman Shah 2018-8-14
编辑：Farman Shah 2018-8-14
_ _ _ _ _ _ _ _ _ _ _ * * * * * * * * * *svmStruct =svmtrain(data(train,:),groups(train),'kernel_function','rbf'); i used this but i also have the same error
Error using svmclassify (line 75) Unknown parameter name: kernel_function.
Error in SVMtest (line 14) testresult = svmclassify(svmStructSurprise,testone,'kernel_function','rbf' );
>>**********____
Dear you are getting the error because you are adding 'Kernel_Function', 'polynomial', 'Polyorder', 4 to svmclassify.Add this kernal parameter to the trainsvm function instead..i.e
SVMStruct = svmtrain(features_train,labels_train,'Kernel_Function', 'polynomial', 'Polyorder', 4);
and it will work... _____

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