Clearly, it is very challenging to learn a CTH from multiple topic hierarchies in different articles due to the following 3 reasons: 1) A topic can be denoted by a variety of tags in different articles (e.g., "foreign aids" and "aids from other countries"); 2) Structural/hierarchical information can be inconsistent (or even opposite) across different articles (e.g., "response subtopicOf aftermath" and "aftermath subtopicOf response" in different earthquake event articles); 3) Intuitively, text descriptions of the topics in Wiki articles are supposed to be able to help determine subtopic relations between topics.
how can we model the textual correlation?