human: Given a hyperedge-centered hypergraph: <hypergraph>, where the center hyperedge groups authors who co-authored the same paper.

Details of the hypergraph:
Center hyperedge (induced by source paper "A Multilingual Dependency Analysis System Using Online Passive-Aggressive Learning"):
  Abstract: This paper presents an online algorithm for dependency parsing problems. We propose an adaptation of the passive and aggressive online learning algorithm to the dependency parsing domain. We evaluate the proposed algorithms on the 2007 CONLL Shared Task, and report errors analysis. Experimental results show that the system score is better than the average score among the participating systems.

Includes members:
  Member "The CoNLL 2007 Shared Task on Dependency Parsing":
    also connected through other hyperedges:
      - Hyperedge HE-1 (induced by source paper "Unsupervised Dependency Parsing with Transferring Distribution via Parallel Guidance and Entropy Regularization")

Question: Please tell me which research area the co-authored paper (i.e., the source paper of the center hyperedge) belongs to. The 4 classes are: Computer science, Mathematics, Engineering, Economics, Psychology, Business. Directly output the class name.

gpt: Computer science