How is Validation and Test cost calculated in Classification Learner app?

I used SVM for classification with LBP features as input. I used 20 percent data for testing in classification learner app with 10-fold Corss-validation. In the summary tab of output it calculates Total Validation and Total Test cost. How does it calculate these numbers?

Answer 1

[Shreeya]

Hi Satish

The validation and testing cost refer to the total number of misclassifications. By default, the app assigns a penalty of 0 if the observation is classified correctly and a penalty of 1 if the observation is classified incorrectly. The penalties can also be changed according to model requirements. You can read more about it in the documentation below.

https://in.mathworks.com/help/stats/misclassification-costs-in-classification-learner-app.html

Hope this helps!

[SATISH SONWANE]

So the cost must be proportional to the accuracy. Like better the accuracy lower the cost. is it?

[Shreeya]

Yes, the cost is inversely proportional to the accuracy.