Robust Domain Adaptation for Relation Extraction via Clustering Consistency

We propose a two-phase framework to adapt existing relation extraction classi-fiers to extract relations for new target do-mains. We address two challenges: neg-ative transfer when knowledge in source domains is used without considering the differences in relation distributions; and lack of adequate labeled samples for rarer relations in the new domain, due to a small labeled data set and imbalance rela-tion distributions. Our framework lever-ages on both labeled and unlabeled data in the target domain. First, we determine the relevance of each source domain to the target domain for each relation type, using the consistency between the clus-tering given by the target domain labels and the clustering given by the predic-tors trained for the source domain. To overcome the lack of labeled samples for rarer relations, these clusterings operate on both the labeled and unlabeled data in the target domain. Second, we trade-off between using relevance-weighted source-domain predictors and the labeled target data. Again, to overcome the imbalance distribution, the source-domain predictors operate on the unlabeled target data. Our method outperforms numerous baselines and a weakly-supervised relation extrac-tion method on ACE 2004 and YAGO. 1