MATLAB: Train, test ,validation confusion matrix

different confusion matrices

while the a confusion matrix is a map of correct and incorrect classifications; what are train ,test,validation confusion matrices? what is their meaning

Best Answer

Hi Yogini,
Confusion Matrices:
These are to evaluate the quality of the output of a classifier on the data set. The diagonal elements represent the number of points for which the predicted label is equal to the true label, while off-diagonal elements are those that are mislabeled by the classifier. The higher the diagonal values of the confusion matrix the better, indicating many correct predictions.
Train, Test , Validation Confusion matrices:
They uses different data for creating confusion matrix. For train confusion matrix it uses predicted values and actual values from train data. Similarly for the other confusion matrices.
You may also refer to the answer to this question:
How to display Confusion matrix of Testing ,Training and Validation without using nprtool - MATLAB Answers - MATLAB Central (mathworks.com)
Hope this helps!
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