how do you store MNIST data and labels as an ImageDatastore object for use in convolutional neural networks

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Ishtiaq Bercha 2018-4-21

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https://ww2.mathworks.cn/matlabcentral/answers/396511-how-do-you-store-mnist-data-and-labels-as-an-imagedatastore-object-for-use-in-convolutional-neural-n

I am trying to do image classification using CNNs but I am not sure how to use image data store on MNIST images and labels. I tried to feed the images and labels directly to trainNetwork but it gave me an error for Y stating it should be numeric or a categoric response. I am not sure how to proceed. Please help! THanks ---Ish