Topic Modeling LDA Gensim

[Sreenath k]

Hi, 
I don't know how to contact you by email, nor am I going to answer your question.
I have a question for you. Please help if you can.

On running the code from this page ( Unsupervised Learning ):
http://nbviewer.ipython.org/gist/rjweiss/7158866#

The output of 
'lda[corpus[1]]'
keeps changing each time. Why is it so ? 

Please help! 

Waiting for your reply, 
Sreenath K