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RMSE of sequences in cell arrays with different length

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In the Sequence-to-Sequence Regression Using Deep Learning example the rmse is caclulated this way
for i = 1:numel(YTest)
YTestLast(i) = YTest{i}(end);
YPredLast(i) = YPred{i}(end);
rmse = sqrt(mean((YPredLast - YTestLast).^2))
in this case we are interested only on the last element so YPredLast - YTestLast is one to one element substraction
IN the general case that i am interested on the whole output sequence, what will be the substraction??
YTest - Ypred cannot be performed as these are cell arrays.
how can we calculate the rmse from the whole sequencies?
  2 Commenti
madhan ravi
madhan ravi il 3 Apr 2019
Modificato: madhan ravi il 3 Apr 2019
You use (i) and you say it’s a cell array ?? No sign of pre-allocation whatsoever.
sotiraw sotiroglou
sotiraw sotiroglou il 19 Apr 2019
Please read more carefully the questions before you write your answers..
The code provided on the example is for a specific example , where the Ytest is a cell array. And YtestLast is not a cell array. So Ytest is a cell array and i am asking how to caclulate rmse on Ytest, if we are interested on a simular example that we do not only want the last element of it, but the whole sequence. I hope this answers to you question???
As for the pre-allocation , i just used an official matlab example. And their code , do you have any comment on the question i ask? thanks

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Risposte (1)

Star Strider
Star Strider il 19 Apr 2019
I am not certain what final result you want.
This should get you started:
subt = cellfun(@minus, YTest, YPred, 'Uni',0); % Vector Differences
RMSE = cellfun(@(x)sqrt(mean(x.^2)), subt, 'Uni',0); % RMSE Of Vector Differences
You can use the cell2mat function to convert the ‘RMSE’ vector to a double vector, and then do any other necessary calculations on it.
Experiment to get the result you want.

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