check to skip keras tests if keras not installed
check to skip keras tests if keras not installed

RaRe-Technologies/gensim,gojomo/gensim,piskvorky/gensim,piskvorky/gensim,gojomo/gensim,macks22/gensim,mattilyra/gensim,summanlp/gensim,gojomo/gensim,gojomo/gensim,ELind77/gensim,RaRe-Technologies/gensim,RaRe-Technologies/gensim,piskvorky/gensim,summanlp/gensim,macks22/gensim,ELind77/gensim,ELind77/gensim,RaRe-Technologies/gensim,summanlp/gensim,macks22/gensim,mattilyra/gensim,robotcator/gensim,markroxor/gensim,markroxor/gensim,mattilyra/gensim,robotcator/gensim,markroxor/gensim,robotcator/gensim