Category in RefClef

[huangjy-pku]

Hello, I found annotations extracted by REFER class in refer.py seems to have some problems regarding categories. When I try to check whether annotations on category are correct, I found the inconsistency between the category dictionary and referring query. For example, the query (target object) is about sky, while its corresponding category is chimney. Would you please check annotations, mainly in 'refclef/instances.json'? Hoping you could reply soon :)