Training ECOC multiclass model with tall arrays

Hello

I have a big feature matrix (6000*40000), rows correspond to (observation) and columns correspond to (predictor variable). i use machine learning to train ECOC multiclass model using fitcecoc matlab function.

Due to the huge size of the feature matrix, I use tall arrays to handle the training data. As the the training data is a matrix, I used arrayDatastore to save the training data and pass it then to the tall array.

When I pass the training data to the fitcecoc function, this error appears:

Error using tall/fitcecoc (line 108)

Argumgent 1 to FITCECOC must be one of the following data types: float

Erroe in classifier_training_using_tall_arrays (line 15)

Gabor_feature_mdl=fitcecoc(Xtrain, Labeltrain, ‘learner’, t);

i trid to use datastore only insist of arrayDatastore, but it can not recognize the data.

thanks in advance

[Ameer Hamza]

What is the class of Xtrain and Labeltrain here? Are these tall arrays? Also, passing 't' as 'learner' value is not correct.

[Amelia]

Xtrain and labeltrain are both double,

both are tall arrays, i used arrayDatastore first to save them and than pass them to tall arrays.

t is the learner template, it is a Discriminant analysis classifier learner.

[Ameer Hamza]

The documentation mentions that fitcecoc does support tall arrays. I am not sure why you are getting this error. For learner type, you need to pass t without the Apostrophes.

[Amelia]

Yes I noticed that and correct it, but it isn't the reason of the error.