what does qas_id stands for?

[xjchen25]

thank you.

[xjchen25]

and also field "impossible"

[ghost]

Thanks for asking.

In this work, each entity type is characterized by a natural language query, and entities are extracted by answering these queries given the contexts. We use (query, context) to represent an example of input. Assume the query denote the entity type C.

• Response to what does qas_id stands for? One (query, context) pair has a unified qas_id. The qas_id is composed by <context order index>.<query order index>.

• Response to what does impossible stands for? If impossible=True, it denotes the (query, context) pair does not have answers (the context does not have entities with the entity type C) . On the contrary, it denotes the (query, context) has at least one answer (the context has at least one entity with the entity type C).