added check for numpy.ndarray for alpha and eta
added check for numpy.ndarray for alpha and eta

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