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 Automatic keyword extraction - no alchemy required! 
 Different datasets for developing and testing keyword extraction algorithms 
 A python implementation of the Rapid Automatic Keyword Extraction 
 Python implementation of TextRank algorithm (https://web.eecs.umich.edu/~mihalcea/papers/mihalcea.emnlp04.pdf) for automatic keyword extraction and summarization using Levenshtein distance as relation between text units. 
 keyword extraction from single document, algorithm from this paper http://ymatsuo.com/papers/ijait04.pdf 
 Information Retrieval - Keyword Extraction Project 
https://github.com/WuLC/KeywordExtraction/tree/master/com/lc/nlp/keyword Keyword Extraction in Java,including TextRank,TF-IDF