I printed all the existing topics within the deals
Please note that the NMF code does similar thing by extracting the topics.
The number of topics is a parameter to tune.
I really think that NMF does better the work but the downside of it is that it didn't work for big data.. Moreover, it's very interesting to test the NMF since we can assess the method even if we don't know in prior the true number of topics. To do so, we need to compute the cophenetic coefficient where the NMF code should be run for multiple times until it converges to finally get that metric.