I am using machine learning classfier to predict my test accuracy. The classfier uses hold out to take data in random. How to I get the train accuracy using the code?

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Atik Faysal 2020-4-15

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https://ww2.mathworks.cn/matlabcentral/answers/518016-i-am-using-machine-learning-classfier-to-predict-my-test-accuracy-the-classfier-uses-hold-out-to-ta

编辑： darova 2020-4-15

%% -------------- Building Classifier ----------------------------
classification_model=fitcnb(data,'class_labels~PC1+PC2');
%% -------------- Test and Train sets ----------------------------
cv=cvpartition(classification_model.NumObservations,'HoldOut', 0.3);
cross_validated_model=crossval(classification_model,'cvpartition',cv);
%% -------------- Making Predictions for Test sets ---------------
predictions=predict(cross_validated_model.Trained{1},data(test(cv),1:end-1));
%% -------------- Analyzing the predictions ---------------------
results=confusionmat(cross_validated_model.Y(test(cv)),predictions)