splitting dataset into training set and testing set

2020 1 14
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更新时间：2021 12 14
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I have 400 images in my dataset(images).I want to split the dataset into 80% for training and 20% for testing.the below attached code works but , test_idx is empty?why?
train_idx contains 320 images.test_idx is empty.
clc
clear
% Load Image dataset
faceDatabase = imageSet('facedatabaseatt','recursive');
%splitting into training and testing sets
N = 400; % number of images
idx = 1:N ;
PD = 0.80 ;
train_idx = idx(1:round(PD*N)); % training indices
test_idx = idx(round(PD*N)+1:end,:) ; % test indices

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Akira Agata
Akira Agata 2020-1-15

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You can split your dataset by using partition function, like:
[setTrain, setTest] = partition(faceDatabase, [0.8, 0.2], 'randomized');

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Munshida P
Munshida P 2020-1-15
I have to split the dataset manually, without using built-in functions.
Akira Agata
Akira Agata 2020-1-15
OK. Then, how about the following?
N = imgSet.Count; % number of images
PD = 0.8;
train_idx = sort(randperm(N,round(N*PD)));
test_idx = setxor(train_idx,1:N);
setTrain = select(faceDatabase,train_idx);
setTest = select(faceDatabase,test_idx);
Munshida P
Munshida P 2020-1-16
Thank you sir. The above code works if i copy all 400 images in a single folder.
But, the original dataset ORL Facedatabaseatt contains 40 folders s1,s2,.....,s40(10 images each of 40 persons).
like that 10x40=400 images.i have to choose 8 images from each person for testing and 2 images for testing.
the following error was occured .
Capture.PNG
Index exceeds the number of array elements (10).
Error in imageSet/selectProperties (line 526)
imgSet.ImageLocation = imgSet.ImageLocation(index);
Error in imageSet/select (line 394)
out(n) = selectProperties(this(end), index);
Error in split (line 12)
setTrain = select(faceDatabase,train_idx);
>>
Rachel Shively
Rachel Shively 2020-6-5
I'm trying to use this to divide my dataset and getting the following error:
[imdsTrain, imdsTest] = partition(imds [0.8, 0.2], 'randomized');
Error using matlab.io.datastore.ImageDatastore/partition
Too many output arguments.
Any alternative suggestions?
Akira Agata
Akira Agata 2020-6-7
>the original dataset ORL Facedatabaseatt contains 40 folders s1,s2,.....,s40(10 images each of 40 persons).
> like that 10x40=400 images.i have to choose 8 images from each person for training and 2 images for testing.
OK. in that case, I would recommend using imageDataStore function, like:
dataFolder = pwd; % if your 40 folders are stored in different folder, please change.
imgSet = imageDatastore(dataFolder,...
'IncludeSubfolders', true,...
'LabelSource', 'foldernames');
% Choose first 8 images from each folder and set them to training dataset, and 2 images for test dataset
[imgSetTrain, imgSetTest] = splitEachLabel(imgSet,0.8);
% If you want to choose 8 and 2 images from each folder randomly, please set 'randomized' option
[imgSetTrain, imgSetTest] = splitEachLabel(imgSet,0.8,'randomized');
Ruaa waleed
Ruaa waleed 2021-12-14
please i split image data base but icant find [imgSetTrain, imgSetTest] how ican make output .txt
clc
F = fullfile('g:','iris-recognition---pm-diseased-human-driven-bsif-main','casia 2 device1');
imds = imageDatastore(F,'IncludeSubfolders',true,'LabelSource','foldernames');
labelCount = countEachLabel (imds)
% Choose first 8 images from each folder and set them to training dataset, and 2 images for test dataset
numTrainFiles= 0.8
% If you want to choose 8 and 2 images from each folder randomly, please set 'randomized' option
[imgSetTrain, imgSetTest] = splitEachLabel(imds,numTrainFiles);

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