Week 14: LDA and NMF topic models

DATA 441/641 · Week 14

Notes

• 14.1 LDA Topic Modeling(slides)
• 14.2 NMF Topic Modeling(slides)
• 14.3 Evaluating Topic Models(slides)

Additional

• Matrix factorization(PDF)

Additional readings

• Blei, Probabilistic topic models
• sklearn: LatentDirichletAllocation

Discussion

• LDA versus NMF: what constraint makes the factors look like topics?
• How would you tell a good topic model from one that only found frequent words?