I'm trying to run Gensim's LdaModel on a corpus. I load the corpus myself from two XML files. I made a class to iterate over the text pieces in the XML files. It converts every text piece to a BOW using a dictionary I built using the XML files. This all works, I've checked that. I then use this iterator to train an LDA model:model = LdaModel(text_iterator, num_topics=10)When I do this however, all topics are empty:In[13]: model.print_topics()Out[13]: [(0,  '0.000*20137 + 0.000*4032 + 0.000*26229 + 0.000*20332 + 0.000*26333 + 0.000*317 + 0.000*2664 + 0.000*13626 + 0.000*18816 + 0.000*22420'), (1,  '0.000*17987 + 0.000*22313 + 0.000*21767 + 0.000*5261 + 0.000*20284 + 0.000*22027 + 0.000*966 + 0.000*349 + 0.000*24857 + 0.000*183'), (2,  '0.000*7879 + 0.000*518 + 0.000*17715 + 0.000*1493 + 0.000*24995 + 0.000*13789 + 0.000*11252 + 0.000*17447 + 0.000*2918 + 0.000*9131'), (3,  '0.000*9601 + 0.000*17656 + 0.000*19358 + 0.000*9690 + 0.000*23146 + 0.000*2264 + 0.000*4974 + 0.000*4022 + 0.000*19941 + 0.000*9122'), (4,  '0.000*20779 + 0.000*14551 + 0.000*21269 + 0.000*15422 + 0.000*17955 + 0.000*22860 + 0.000*2076 + 0.000*18358 + 0.000*9560 + 0.000*2977'), (5,  '0.000*23836 + 0.000*19651 + 0.000*5808 + 0.000*6156 + 0.000*20544 + 0.000*7681 + 0.000*9566 + 0.000*6945 + 0.000*26141 + 0.000*20062'), (6,  '0.000*7037 + 0.000*24278 + 0.000*5344 + 0.000*9728 + 0.000*23999 + 0.000*13210 + 0.000*10789 + 0.000*2823 + 0.000*23370 + 0.000*9440'), (7,  '0.000*3447 + 0.000*19113 + 0.000*18941 + 0.000*9960 + 0.000*15887 + 0.000*16232 + 0.000*3986 + 0.000*4990 + 0.000*4393 + 0.000*15064'), (8,  '0.000*8251 + 0.000*2122 + 0.000*22461 + 0.000*17461 + 0.000*25932 + 0.000*15056 + 0.000*25561 + 0.000*11463 + 0.000*4413 + 0.000*17334'), (9,  '0.000*16085 + 0.000*21046 + 0.000*5507 + 0.000*2292 + 0.000*13859 + 0.000*13897 + 0.000*15937 + 0.000*10399 + 0.000*15231 + 0.000*7106')]What can be the cause of this? Note that I don't know whether this is caused by the theoretical nature of the LDA model or Gensim's implementation specifically. Therefore, I posted my question here, and not on StackOverflow.Here is a link to the LDA (Latent Dirichlet Alloction) model on Wikipedia: LDA
Gensim LDA all topics zero
natural language processing;information retrieval