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Observations being read as number of columns instead of rows

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Before splitting my data into training, validation, and testing, the code worked fine. After the split, trainnet begins reading the observations as the number of columns instead of by the number of rows. I checked the size of the array files and they are the same size the arrays were before I added a data split. I do not understand why trainnet starts reading the arrays differently. Any help would be appreciated.
Error message:
Error using trainnet
Error forming validation data mini-batch.
Error in MainCode6 (line 40)
netTrained = trainnet(stan_x_train, stan_y_train, net, "mse", opts);
Caused by:
Number of observations in predictors (6) and targets (1) must match. Check that the data and network are
consistent.
% Script Number One
all = readtable(excelFile,"Sheet","Nsplit6",'VariableNamingRule','preserve');
train_ratio = 0.8;
val_ratio = 0.1;
test_ratio = 0.1;
num_samples = size(all, 1);
indices = randperm(num_samples);
num_train = floor(train_ratio * num_samples);
num_val = floor(val_ratio * num_samples);
num_test = num_samples - num_train - num_val;
train_indices = indices(1:num_train);
val_indices = indices(num_train+1:num_train+num_val);
test_indices = indices(num_train+num_val+1:end);
train_data = all(train_indices, :);
val_data = all(val_indices, :);
test_data = all(test_indices, :);
X_train = train_data(:, 1:end-1);
Y_train = train_data(:, end);
X_val = val_data(:, 1:end-1);
Y_val = val_data(:, end);
X_test = test_data(:, 1:end-1);
Y_test = test_data(:, end);
stan_x_train = table2array(X_train);
stan_y_train = table2array(Y_train);
stan_x_val = table2array(X_val);
stan_y_val = table2array(Y_val);
stan_x_test = table2array(X_test);
stan_y_test = table2array(Y_test);
%Script number two
inputSize = 6;
hiddenLayerSize1 = 40;
hiddenLayerSize2 = 20;
hiddenLayerSize3 = 10;
outputSize = 1;
layers = [
featureInputLayer(inputSize)
fullyConnectedLayer(hiddenLayerSize1, 'Name', 'fc1')
reluLayer('Name', 'relu1')
fullyConnectedLayer(hiddenLayerSize2, 'Name', 'fc2')
reluLayer('Name', 'relu2')
fullyConnectedLayer(hiddenLayerSize3, 'Name', 'fc3')
reluLayer('Name', 'relu3')
fullyConnectedLayer(outputSize, 'Name', 'output')
];
net = dlnetwork(layers);
opts = trainingOptions('adam', ...
'InitialLearnRate', 0.01, ...
'MaxEpochs', 200, ...
'MiniBatchSize', 20, ...
'ValidationData', {stan_x_val', stan_y_val'}, ...
'ValidationFrequency', 20, ...
'Verbose', true ...
);
netTrained = trainnet(stan_x_train, stan_y_train, net, "mse", opts);

Accepted Answer

Stephen23
Stephen23 on 5 May 2024
Moved: Matt J on 7 May 2024
Perhaps because the data are (complex conjugate) transposed here:
'ValidationData', {stan_x_val', stan_y_val'},
Note that you can very easily simplify your code by using curly braces to access the table content:, e.g. replace:
X_train = train_data(:, 1:end-1);
..
stan_x_train = table2array(X_train);
with
stan_x_train = train_data{:,1:end-1};
% ^ ^ curly-braces = table content
  1 Comment
Candace
Candace on 7 May 2024
Moved: Matt J on 7 May 2024
Thank you, this helped. I am trying to accept your answer, however, the button is not visible.

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