U e:@s,dZddlZddlmZGdddeZdS)u^ ISRI Arabic Stemmer The algorithm for this stemmer is described in: Taghva, K., Elkoury, R., and Coombs, J. 2005. Arabic Stemming without a root dictionary. Information Science Research Institute. University of Nevada, Las Vegas, USA. The Information Science Research Institute’s (ISRI) Arabic stemmer shares many features with the Khoja stemmer. However, the main difference is that ISRI stemmer does not use root dictionary. Also, if a root is not found, ISRI stemmer returned normalized form, rather than returning the original unmodified word. Additional adjustments were made to improve the algorithm: 1- Adding 60 stop words. 2- Adding the pattern (تفاعيل) to ISRI pattern set. 3- The step 2 in the original algorithm was normalizing all hamza. This step is discarded because it increases the word ambiguities and changes the original root. N)StemmerIc@seZdZdZddZddZd"ddZd d Zd d Zd dZ ddZ ddZ ddZ ddZ ddZddZddZddZdd Zd!S)# ISRIStemmera& ISRI Arabic stemmer based on algorithm: Arabic Stemming without a root dictionary. Information Science Research Institute. University of Nevada, Las Vegas, USA. A few minor modifications have been made to ISRI basic algorithm. See the source code of this module for more information. isri.stem(token) returns Arabic root for the given token. The ISRI Stemmer requires that all tokens have Unicode string types. 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