A question about unknown tag in CCG

[Yufang-Liu]

Hi, it seams that you only use 425 tags, and the other tag will be mapped to unknown tag. The model will learn that these word's gold label is unknown tag. I wonder in the test, if the real tag is mapped to unknown tag , and the model's prediction is also unknown tag. Should I the classification is right? Or I should force the model not to predict unknown tag? I appreciate your help.