Error when trying to follow Deep learning example

Dears,

I strongly suspect that my question is rather fundamental and basic and less related to Deep learning but because I wanted to highlight the context hence the title of this thread.

Well, this is how I am trying to execute the "Word-By-Word Text Generation Using Deep Learning" example which uses text from Alice in Wonderland.

When calling:

ds = documentGenerationDatastore(documents);

I get the error message:

'documentGenerationDatastore' is used in Word-By-Word Text Generation Using Deep Learning.

The above message looks like an affirmative sentence, which of course I can agree with but it is a bit laconic.

Does anyone perhaps know what is causing this error?

Have nice evening to everyone :)

Answer 1

[Adam Danz]

Updated answer (11/28/22)

The documentation page for the Word-By-Word Text Generation Using Deep Learning example has been updated to instruct users to open the example in a Live Script to access the documentGenerationDatastore.m file.

Copy the command using this button on the doc page, then execute the command from MATLAB's command window.

Original answer

I agree that the error message isn't helpful.

Based on the documentation, documentGenerationDatastore.m, should be stored on my system in,

C:\Program Files\MATLAB\R2021a\examples\nnet\main\

or on any system,

fullfile(matlabroot,'examples','nnet','main','documentGenerationDatastore.m')

and while I have the Deep Learning Toolbox and the nnet>main folder, the file is missing (r2021a). The documentation also shows how to create your own custom mini-batch datastore in Develop Custom Mini-Batch Datastore but that's not helpful to understand what should be in documentGenerationDatastore.m.

I'd contact Tech Support using: Contact Us - MATLAB & Simulink

And let us know what the resolution is.

[Maciej Staszak]

Thank you Adam for advice. I contacted support and am waiting for their response.

Meanwhile I was succesful at finding this function 'documentGenerationDatastore.m' and even succesfully passed this part of the code. But then finally there was an error in the function that trains the network. I decided to change the example to the "Pride and Prejudice" example with character embeddings. This works fine so I can get accustomed to the way Matlab works.

Have nice day!

[Adam Danz]

Where/how did you find the file?

[Maciej Staszak]

Previously I had Matlab 2020b, and tried to run this example at that time, so it is in:

C:\Users\maciej\....\MATLAB\Examples\R2020b\deeplearning_shared\WordByWordTextGenerationUsingDeepLearningExample

When updating yesterday to 2021a I did not remove this old version. I am very new in Matlab environment but I really like it at first glance/clicks.

[Adam Danz]

Thanks, Maciej. But I'm still confused, not because of your comments but because of the documentation.

The r2020b documentation shows that the file should be in

fullfile(matlabroot,'examples','nnet','main','documentGenerationDatastore.m')

not in the deeplearning folder. Perhaps this is the error (in the documentation).

[mark palmer]

Did you ever figure out how to solve this with the Alice in Wonderland text?

[Adam Danz]

@mark palmer see my updated answer and let us know if you have any further problems.