Undefined function or variable 'sequenceInputLayer' when following Matlab Example with all extensions installed

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James Cameron 2018-6-22

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https://ww2.mathworks.cn/matlabcentral/answers/406880-undefined-function-or-variable-sequenceinputlayer-when-following-matlab-example-with-all-extension

评论： Husnain Iqbal 2019-1-28

采纳的回答： Siwan Yang

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I'm trying to follow the Time Series Forecasting Using Deep Learning example from the Neural Network Toolbox.

I'm fairly certain that I have the correct packages installed. Image of my add-ons manager is below:

Following the example line for line, I get stock on the following command:

layers = [ ...
    sequenceInputLayer(inputSize)
    lstmLayer(numHiddenUnits)
    fullyConnectedLayer(numResponses)
    regressionLayer];

Matlab produces the following error:

Undefined function or variable 'sequenceInputLayer'.
Error in ForecastModel (line 27)
    sequenceInputLayer(inputSize)

I cannot figure out why the function does not work as it is part of the installed Neural Network Toolbox. Do I need to do anything special to activate this toolbox within the current project or is there any other advice on how to get past this error?

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Geoff Hayes 2018-6-22

James - which version of MATLAB are you using? According to sequenceInputLayer this function was introduced in r2017b. If your version is older than this, then this function will not exist.

James Cameron 2018-6-25

Thank you for the answer, Geoff. I'm using an education license of R2016B supplied by my University so that will be the reason.

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Answer 1

Siwan Yang 2018-6-22

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Hello James,

As Geoff mentioned, the ‘sequenceInputLayer’ function is introduced since R2017b, so if you could upgrade to MATLAB R2017b or above version, this issue no longer exists.

For more information regarding this function please see: https://www.mathworks.com/help/nnet/ref/nnet.cnn.layer.sequenceinputlayer.html?searchHighlight=sequenceInputLayer

Thanks, Siwan

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James Cameron 2018-6-25

Thanks Siwan, yes this will be the issue. I'm using a R2016B license supplied by my University so I'm not sure if I can upgrade.

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Answer 2

Husnain Iqbal 2019-1-27

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James Cameron, kindly guide me about the solution. I've same issue i.e. Undefined function or variable 'sequenceInputLayer'.

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Steven Lord 2019-1-28

As Siwan Yang said, this function was introduced in release R2017b. If you're using a release that's older than that, you will not be able to use this function.

Husnain Iqbal 2019-1-28