How do I improve my result of KNN classification using confusion matrix?
3 vues (au cours des 30 derniers jours)
Afficher commentaires plus anciens
Hello everyone.
I'm trying to classify a data set containing two classes using a Knn classifer.
and would like to evaluate the performance using its confusion matrix. But how can I use it with the KNN classifier?
This is my code of KNN classifer
model=ClassificationKNN.fit(X,Y,'NumNeighbors',9);
[~,result1]=predict(model,x);
2 commentaires
Image Analyst
le 16 Nov 2019
Modifié(e) : Image Analyst
le 16 Nov 2019
You forgot to attach X and Y in a .mat file
save('answers.mat', 'X', 'Y');
Have you tried the "Classification Learner" App on the App tab of the tool ribbon?
You tagged it with image processing. What about this is at all related to image processing???
Réponses (1)
Ridwan Alam
le 20 Nov 2019
yhat = predict(model,x);
[C,order] = confusionmat(y,yhat);
Use this help file to understand how to use C and order:
2 commentaires
Ridwan Alam
le 20 Nov 2019
Here, I am assuming you have trained the model with “X” and “Y”, and are testing with “x” and “y”. “X” and “x” are different data, if in matrix format, they should have same number of columns but different row sizes.
“yhat” is the prediction of your model for test data “x” (not “X”). Confusionmat compares “yhat” with the ground truth or labels “y” (not “Y”) for the test data “x”.
Voir également
Catégories
En savoir plus sur Deep Learning for Image Processing dans Help Center et File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!