Classification neural network - single image or datastore

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Elvira
Elvira on 2 Nov 2021
Commented: Prateek Rai on 12 Nov 2021
Hello,
how is it possible to have different results (true positive) using the following methods?
1) augimds = augmentedImageDatastore(inputSize(1:2), imds); %only resize
[predictedClasses1, predictedScores1] = classify(net, augimds);
create a datastore, resize the image of the datastore, classify the images
2)[YPred,scores] = classify(net,imgLaikaGrass);
take each image belonging to the previous datastore (one-by-one) and classify it. Images have been already resized accordingly.
Confusion chart results in a different number of true positives in comparing the two methods. In other words, why an image correctly classified in 1) is not correctly classified using 2).
Thank you

Answers (1)

Prateek Rai
Prateek Rai on 6 Nov 2021
To my understanding, you are using two methods that ideally should yield the same result but on implementation getting different results. This also happens when you train the same network but get different results each time. You can refer to the following MATLAB Answer post on "Different neural network training result each time" to get more idea.
  2 Comments
Prateek Rai
Prateek Rai on 12 Nov 2021
Hi,
Refer to the following MATLAB Answer post on "https://www.mathworks.com/matlabcentral/answers/50-why-am-i-getting-different-performance-results-from-neural-network-trained-with-100-train-0-valid" to learn exact reason on why we get different results even when we use the same net for classification.
Thanks

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