Fix ranking formula in gensim.summarization.bm25. Fix #1718 (#1726)
Fix ranking formula in gensim.summarization.bm25. Fix #1718 (#1726)


piskvorky/gensim,piskvorky/gensim,piskvorky/gensim,mattilyra/gensim,gojomo/gensim,markroxor/gensim,RaRe-Technologies/gensim,gojomo/gensim,mattilyra/gensim,RaRe-Technologies/gensim,RaRe-Technologies/gensim,RaRe-Technologies/gensim,markroxor/gensim,mattilyra/gensim,gojomo/gensim,gojomo/gensim,markroxor/gensim