relation提取的方法参考:https://www.cs.cornell.edu/home/cardie/papers/acl13-joint.pdf
dependencyTree提取relation的规则,参考:https://web.science.mq.edu.au/~rdale/transfer/CL/10-010.pdf
relation提取的方法参考:https://www.cs.cornell.edu/home/cardie/papers/acl13-joint.pdf
dependencyTree提取relation的规则,参考:https://web.science.mq.edu.au/~rdale/transfer/CL/10-010.pdf