Identifiability Challenges in Topic Modeling: A Review of NMF and Related Algorithms

This ArXiv article provides a valuable review of several latent variable models, highlighting the critical issue of identifiability. Addressing identifiability is crucial for the reliability and interpretability of these models in various applications.

• •Reviews NMF, PLSA, LBA, EMA, and LCA models.
• •Highlights the critical identifiability problem.
• •Focuses on theoretical aspects rather than practical applications.