Topic Modelling via NMF - Solution to an assignment in the course Data Mining and Matrices at the University of Mannheim.
The PDF file contains the discussion of the findings/observations when repeatedly running NMF, and e.g. comparing it to the SVD.
The R file contains the code to reproduce the results.
The ground truth topics are being derived from a subset of the 20 Newsgroup dataset (4 topics in total).