AttributeError: module 'keras.preprocessing.sequence' has no attribute 'pad_sequences'

This error typically occurs when you try to use the pad_sequences function from the keras.preprocessing.sequence module but the function is not found in the module. This can happen if you are using an older version of Keras or if you have not imported the function correctly.

To fix this error, you can try importing the pad_sequences function from the keras.preprocessing.sequence module explicitly:

from keras.preprocessing.sequence import pad_sequences

Then, you can use the function as follows:

padded_sequences = pad_sequences(sequences, maxlen=max_length, padding='post')

Make sure that you have the latest version of Keras installed and that you have imported all the necessary modules correctly.