things

adam optimizer가 sgdm보다 성능이 좋음
adam 사용시 250회 훈련해도 충분함

학습 많이하면 overfitting 생김
countEachLabel을 빼고 하나의 폴더에 사진을 넣을 시 참고
class1 = imageDatastore({'cat1/random_folder/','cat1/'});
class1.Labels = repelem("cat1",numImages);
imdsFinal = imageDatastore([class1.Files; class2.Files]);
imdsFinal.Labels = [class1.Labels; class2.Labels]);

imds = imageDatastore(fullfile(matlabroot, 'toolbox', 'matlab', {'demos','imagesci'}),...
'LabelSource', 'foldernames', 'FileExtensions', {'.jpg', '.png', '.tif'})
imds = 

  ImageDatastore with properties:

      Files: {
             ' ...\matlab\toolbox\matlab\demos\cloudCombined.jpg';
             ' ...\matlab\toolbox\matlab\demos\example.tif';
             ' ...\matlab\toolbox\matlab\demos\landOcean.jpg'
              ... and 5 more
             }
     Labels: [demos; demos; demos ... and 5 more categorical]
    ReadFcn: @readDatastoreImage

---------------------------------------
tif파일만 읽기
imds = imageDatastore(fullfile(matlabroot,"toolbox","matlab"),...
"IncludeSubfolders",true,"FileExtensions",".tif","LabelSource","foldernames")
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https://kr.mathworks.com/help/matlab/ref/startswith.html
https://kr.mathworks.com/help/matlab/ref/mfilename.html
https://kr.mathworks.com/help/matlab/ref/count.html
imds.Labels=repmat(a, size(imds.Labels, 1), 1)