What is the second output of the model

For the ‘next_symbol’ function, just out of curiosity, what is the second output of the model, which was denoted ‘_’,?

output, _ = model((padded_with_batch, padded_with_batch))

_ here is equal to padded_with_batch (second, which values are the same as first’s in this case)

In case of the sentence “I want to fly in the sky.” :

array([[  13,  483,  320, 4219,  132,  213, 2775,   10,    1,    0,    0,
           0,    0,    0,    0,    0]])