Abstract
Many applications in information extraction, natural language understanding, information retrieval require an understanding of the semantic relations between
entities. We present a comprehensive review of various aspects of the entity relation extraction task. Some of the most important supervised and semi-supervised
classification approaches to the relation extraction task are covered in sufficient
detail along with critical analyses. We also discuss extensions to higher-order relations. Evaluation methodologies for both supervised and semi-supervised methods are described along with pointers to the commonly used performance evaluation datasets. Finally, we also give short descriptions of two important applications
of relation extraction, namely question answering and biotext mining.
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