How to predict the output from a classifier model?

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Jimmy Neutron 2021-5-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/839225-how-to-predict-the-output-from-a-classifier-model

I have used the classification learner to train image data using a SVM. The output shows it to be 95% and the confusion matrix looks as follows:

When I export the model and try to predict the Image features in matlab I get a confusion matrix as the one below, which seems weird and makes me believe I am doing something incorrect. Could someone please help?

% Training Data
imset = imageSet('HOG\Train_Diff','recursive');
bag = bagOfFeatures(imset);
imageFeatures = encode(bag, imset);
signData = array2table(imageFeatures);
signData.signType = getImageLabels(imset);
% Test Data
imsetTest = imageSet('HOG\Test_Diff','recursive');
bagTest = bagOfFeatures(imsetTest);
imageFeaturesTest = encode(bagTest, imsetTest);
signDataTest = array2table(imageFeaturesTest);
signDataTest.signType = getImageLabels(imsetTest);
%% Classification 
classificationLearner
%%  Test Data Confusion matrix
model = trainedModel.ClassificationSVM;
predictedLabels = predict(model, imageFeaturesTest);
testLabels = signDataTest.signType;
plotconfusion(testLabels,predictedLabels)