<human>:  Why do you have a hidden layer in the transformer model?
<bot>: The hidden layer is there to help the model learn. It’s a way of capturing knowledge in the model. For example, if I want to know what the word “cat” means, I might feed the model the words “kitten” and “cute”. This way, the model learns that the word “cat” is associated with the words “kitten” and “cute”.