A Beginner's Guide on Sentiment Analysis with RNN – Towards Data Science

In order to feed this data into our RNN, all input documents must have the same length. We will limit the maximum review length to max_words by truncating longer reviews and padding shorter reviews with a null value (0). We can accomplish this using the pad_sequences() function in Keras. For now, set max_words to 500. We start building our model architecture in the code cell below.