fitcecoc svm classifier error

I am using MATLAB R2018b. I have two matrices X_norm (2000*20 double) which has my normalized observations and matrix Y (2000 * 1 double) has the class labels. I want to get an svm classifier model using X_norm and Y.

I have executed the following line

Mdl = fitcecoc(X_norm,Y,'Learners','svm','BoxConstraint',0.1);

and I get an error showing "Error using classreg.learning.FitTemplate/fillIfNeeded (line 634), BoxConstraint is not a valid parameter name."

Could anyone help me out with this issue?

[Pradyumna Reddy]

I have tried this:

params = hyperparameters('fitcecoc',X_norm,Y,'svm');

params(2).Name

It gives the output as 'BoxConstraint' but I am not able to edit the hyperparameter with the mentioned code line in the question.

Answer 1

[Don Mathis]

You need to pass fitcecoc a templateSVM object to set an SVM hyperparameter,

Mdl = fitcecoc(X_norm, Y, 'Learners', templateSVM('BoxConstraint', 0.1))