Invalid validation data. For a recurrent layer with output mode 'last', responses must be a categorical column vector.

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I am trying to train LSTM network following the example given in mathworks entitled "Classify Videos Using Deep Learning". But I am getting an error. I am attaching here the screenshot of the error.
In this screenshot the error is responses must be a categorical column vector. In my case, as you can see in the code (line no. 154) responses are named as labelsTrain. In the workspace you can see labelsTrain is categorical. I am not getting the reason behind this error and hence unable to find a way out of it. Please suggest some solution for this.
If my query is not clear, feel free to comment.

Accepted Answer

Walter Roberson
Walter Roberson on 19 Aug 2021
Your Validation Data responses that you are passing through your options is a categorical row vector, but needs to be a categorical column vector.

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