Abstract
Named entity recognition is an important research direction of natural language processing. This paper first reviews the development process and main stages of named entity recognition, then expounds the research contents and methods of named entity recognition, and puts forward the key and difficult points of named entity recognition, The development process of named entity recognition is from the initial rule-based and dictionary based method to the later statistical learning method, and then to the mixed learning method and some popular learning methods. Finally, the development of named entity recognition is prospected.
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