Critique

Overall a nice article covering the two methodologies. Some of my suggestions are:

1. I felt LDA by itself needed a better explanation. Maybe give a mathematic formulation for LDA.
2. Some latex words don't appear aesthetically appealing (like tf idf vectorizer). Maybe a workaround?
3. I felt the conclusion needs to be a bit more substantial but nonetheless follows from the experiments.

I would grade it 18 out of 20.

Thank you for the feedback, Kevin!