Error using classreg.learning.FullClassificationRegressionModel.prepareDataCR (line 213) X must be a numeric matrix.

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Melvyn Smith 2019-10-31

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回答： Chirdpong Deelertpaiboon 2022-4-12

Why do I get this error when running the "Deep Learning Example: Feature Extraction using AlexNet and CIFAR-10 Dataset"?

"Error using classreg.learning.FullClassificationRegressionModel.prepareDataCR (line 213) X must be a numeric matrix."

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Guillaume 2019-11-1

在 MATLAB Online 中打开

I don't have the toolbox so can't test the example.

The obvious question is what is X then? Set matlab to break into the debugger when it encounters an error with:

dbstop if error

run the example the code and when it breaks into the debugger, look at the class and content of X.

Adam Danz 2019-11-1

I googled the demo you mentioned because no link was provided. It led to a file exchange by Math Works and someone else has recently left a comment on that page with the same error. Actually, there are quite a few errors listed in the comments.

I'm unfamiliar with the toolbox and we don't have much info here. If the demo is just meant to be run without any user inputs then the error may be due to an incompatible matlab release/version.

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Answer 1

Chirdpong Deelertpaiboon 2022-4-12

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I hope this is not too late for your question. I just found the answer from this post

https://www.mathworks.com/matlabcentral/answers/405270-error-using-classreg-learning-fullclassificationregressionmodel-preparedatacr-line-192-x-must-be-a

This works for me. There are two lines from the example code that need to correct. The first one is

trainingFeatures = activations(convnet, trainingSet, featureLayer,'OutputAs','rows');

The second one is

testFeatures = activations(convnet, testSet, featureLayer,'OutputAs','rows');

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Answer 2

Melvyn Smith 2019-11-1

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Yes, I see those comments also. That page does not seem to be a forum for getting help (lots of questions but no answers). Actually, there does not seem to be much help and guidance available generally for MATLAB and deep learning. I've only found a couple of books and nothing really good on-line. Maybe MATLB is not the way to go and something like Python or Java is better. I am trying to get into CNNs. I read several books and feel I know the underlying concepts. Unfortunately, the valley of death seems to be going from that to coding CNNs for one's own applications.