#io-tagging

Question 1: Single choice

mediumAI-checkedNLP Tasks

IO tagging drops the B tag: every token of an entity of type X gets I-X, and all other tokens get O. What information does it lose compared with BIO tagging?

Where one entity ends and the next begins, for adjacent entities of the same type1
The type of each entity, since I tags no longer name a class2
Whether a token belongs to any entity at all3
The position of single-token entities, which need a B tag to be represented at all4

Timed test