...
To categorize the sentence The food was delicious! into a positive or a negative label, one would define two corresponding hypotheses such as, This person expresses a positive sentiment and This person expresses a negative sentiment. The model will infer a stronger semantic relationship with the positve positive tag.
For the ease of use, we can create pattern templates with a curly-bracket placeholder for replacing the corresponding label each time. In the example above, it would have been This person expresses a {} sentiment.
...