Invalid training data. The output size ([1 1 1]) of the last layer does not match the response size ([1 1 1773])

Hi,

I am trying for solar power prediction using cnn. It has 6 input features and 1 output. I have tried the following code. But i got the error during training as "Invalid training data. The output size ([1 1 1]) of the last layer does not match the response size ([1 1 1773])".

%% load data
% XTraining & YTraining
input_data = xlsread("forecast_data.xlsx", 1);
len_train = floor(0.8*length(input_data));

XTrain = input_data(1:len_train,1:6);
YTrain = input_data(1:len_train,7);
XTrainReshaped = reshape(XTrain, [len_train 6 1 1]);
YTrainReshaped = reshape(YTrain, [len_train 1 1 1]);

% create convolutional network
Conv1 = convolution2dLayer([1 1], 10, 'NumChannels',1, 'Stride',[1,1], 'Padding',[1 1 1 1], WeightLearnRateFactor=1, ...
    BiasLearnRateFactor=1, name='Conv1')
Conv1.Weights = sqrt(2/(9*10)) * randn(1,1,1,10,'single');
Conv1.Bias = randn(1, 1, 10, 'single');
% construct layer
input_data2 = [imageInputLayer([6 1 1])]
layers = [input_data2; convolution2dLayer(1,32); reluLayer; ...
    convolution2dLayer(1,64); reluLayer; convolution2dLayer(1,128); reluLayer; dropoutLayer(0.2); ...
    fullyConnectedLayer(1); softmaxLayer; regressionLayer];
% training option
opts = trainingOptions('adam', 'MaxEpochs',10, 'InitialLearnRate',0.0001, ...
    'GradientThreshold',0.1)
net = trainNetwork(XTrainReshaped', YTrainReshaped', layers, opts);

Please help me to rectify this error. Also, if possible suggest me a code to run the forecasting.

Thank you in advance.

[Image Analyst]

If you have any more questions, then attach your data ("forecast_data.xlsx") with the paperclip icon after you read this:

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[Walter Roberson]

what is

numel(unique(YTrainReshaped))

?

[Muthukannan]

Hi sir,

Thank you for the reply.

numel(unique(YTrainReshaped)) is 1773. Here in this reply, i have attached a file with 200 sample data. Please help me to rectify.

Thank you.

Answer 1

[Manikanta Aditya]

Hi,

As per my understanding, you are getting an error “Invalid training data. The output size ([1 1 1]) of the last layer does not match the response size ([1 1 1773])".

After a quick google search, I found few related references to your error:

• https://www.matlabsolutions.com/resources/the-output-size-of-the-last-layer-does-not-match-the-response-size-.php
• https://www.reddit.com/r/matlab/comments/xvn14p/help_with_application_of_cnn_for_regression/

I hope this resolves the issue you were facing.

[Muthukannan]

Thank you so much.