In today's big data era, there are a large number of unstructured information resources on
the web. Natural language processing researchers have been working hard to figure out
how to extract useful information from them. Entity Relation Extraction is a crucial step in
Information Extraction and provides technical support for Knowledge Graphs, Intelligent Q&A
systems and Intelligent Retrieval. In this paper, we present a comprehensive history of entity
relation extraction and introduce the relation extraction methods based on Machine …