MATLAB Answers


LSTM SequenceLength and Batch Explained

Asked by MB Sylvest on 17 Mar 2019
Latest activity Commented on by Jan
on 15 Jul 2019
Hi Matlab staff
In this example, the sequencelength is by default longest. Does that mean that the sequencelength is 500 (I dont think it is! as this would make the algorithm much more computational extensive). Does that mean sequencelength is 1 then? It is unclear how the data is fed into the model. Further, a single batch is used (I assume! because changing minibatch size does not change the algorithm). Could you elaborate on the sequencelength and batchsize in this particular example ?.
I think this is very important for LSTM in Matlab community that there is full understanding of how the LSTM in Matlab is designed.
Cheers, MB


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on 15 Jul 2019
@MB Sylvest: Please do not remove a question after an answer has been given.

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1 Answer

Answer by Abhishek Singh on 25 Mar 2019
 Accepted Answer

Hi MB Sylvest,
According to the documentation provided you can know about the sequence length and batch size using trainingOptions.
When you try running the example and see the values of trainingOptions you’ll get to know that it took the default sequence length as ‘longest’ (which means it is 500) and batch size as 128.
I’ve added the screenshot for your reference:
You may also find these links to be useful:


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