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Same training results for each epoch using LSTM sequence to sequence

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Dear all,
I am following the example given in:
using different data but similar in structure to the one in the example.
The problem is when I train the data, the results for each epoch look the same (please see the picture attached).
I use the following setting options for training:
maxEpochs = 20;
miniBatchSize = 20;
options = trainingOptions('adam', ...
'MaxEpochs',maxEpochs, ...
'MiniBatchSize',miniBatchSize, ...
'InitialLearnRate',0.01, ...
'GradientThreshold',1, ...
'Shuffle','never', ...
I use a single LSTM layer with 128 hidden units working on MATLAB R2022b.
Any advise or idea is really appreciated.

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