%学習イメージの取得
food_ds = imageDatastore('/Users/mizuno/Documents/MATLAB/deep01/image','IncludeSubfolders',true,'LabelSource','foldernames','ReadFcn',@imageread);
[trainImgs,testImgs] = splitEachLabel(food_ds,0.8);
numClasses = numel(categories(food_ds.Labels));