From what I understand is that if your model has multiple classes, ensure that the index you are passing to "gradCAM" corresponds to the correct class index. You need to convert the categorical class label to an index. Kindly refer to the below code for an example:
classIndex = find(class == categories(class)); % Example conversion to index
% Call the gradCAM function
gradCamMap = gradCAM(trainedNetwork_1, MRI, classIndex);
For more information on "gridCAM", refer to this MATLAB documentation:
If the issue persists, could you please share the code file where you are encountering this error? So that I can investigate the issue.
