Hi,
The proper input format to train a LSTM Network should be as follows,
XTrain = N x 1 cell
YTrain = N x 1 , where N denotes the Number of Sequences/Training Examples.
Each cell in Training set can have variable number of columns, but a definite set of rows. It implies each cell is of the form K x L, where K is the number of input features and L is the input data for that feature.
Here in your case, I doubt there is an issue with your XTrain cell. Try modifying your XTrain to match the input format specified above.
Hope this helps!
