This problem related to Image processing and Deep learning using matlab.io.​datastore.​PixelLabel​Datastor

In fact, I'm trying to download the spectrogram images (as input data, collected in a folder) and their labels for each pixel (collected in another folder). This work is to train a deep learning model.

after compilation, an error is displayed.

the code:

clear

clc

imds = imageDatastore('....data\trainingSet\input','IncludeSubfolders',false,'FileExtensions','.png');

classNames = ["NR" "LTE" "Noise"];

pixelLabelID = [127 255 0];

pxdsTruth = pixelLabelDatastore('....\data\trainingSet\label',classNames,pixelLabelID,...

'IncludeSubfolders',false,'FileExtensions','.png');

tbl = countEachLabel(pxdsTruth);

frequency = tbl.PixelCount/sum(tbl.PixelCount);

figure

bar(1:numel(classNames),frequency)

grid on

xticks(1:numel(classNames))

xticklabels(tbl.Name)

xtickangle(45)

ylabel('Frequency')

[imdsTrain,pxdsTrain,imdsVal,pxdsVal] = helperSpecSensePartitionData(imds,pxdsTruth,[80 20]);

cdsTrain = combine(imdsTrain,pxdsTrain);

cdsVal = combine(imdsVal,pxdsVal);

imageSize = [256 256];

cdsTrain = transform(cdsTrain, @(data)preprocessTrainingData(data,imageSize));

cdsVal = transform(cdsVal, @(data)preprocessTrainingData(data,imageSize));

The Errror:

Error using matlab.io.datastore.PixelLabelDatastore/subset

Cannot access method 'subset' in class 'matlab.io.datastore.PixelLabelDatastore'.

Error in helperSpecSensePartitionData (line 25)

pxdsTrain = subset(pxds, shuffledIndices(1:numTrain));

Error in mainProgramSRNet (line 25)

[imdsTrain,pxdsTrain,imdsVal,pxdsVal] = helperSpecSensePartitionData(imds,pxdsTruth,[80 20]);

[Pramil]

As per the error message, it seems MATLAB is not able to access the subset function, can you try the following command:

• which -all subset

The above should give you path to "ImageDatastore.m".

You can also try running MATLAB with administrative access, which you can do by searching MATLAB in windows search and right-clicking, then selecting "Run as administrator" to see if MATLAB is able to access the file then.

[Chaymae]

Thank you for the response,,,i tried with "Run as administrator" the error still the same.....and with commend do you mean "which -all subset" ?? can you tell me please when should i add it ?

[Anjaneyulu Bairi]

Run the command "which -all subset", in your MATLAB Command Window.

Answer 1

[Aryan]

Hi!

I understand that you are running into an error with the "subset" method in your code.

The issue is because the "subset" method for "PixelLabelDatastore" only exists in MATLAB R2021a and newer. If you are using an older version, that function just isn’t available.

Kindly refer to the following MathWorks documentation links for better understanding the functions used above:

• https://www.mathworks.com/help/releases/R2021a/vision/ref/pixellabeldatastore.html

Hope it helps!