Coefficient Matrix

• NMF: an unsupervised family of algorithms that simultaneously perform dimension reduction and clustering. • Also known as positive matrix factorization (PMF) and non-negative matrix approximation (NNMA). Insight Latent Space Workshop 2 • No strong statistical justification or grounding. • But has been successfully applied in a range of areas:- Bioinformatics (e.g. clustering gene expression networks).- Image processing (e.g. face detection).- Audio processing (e.g. source separation).- Text analysis (e.g. document clustering)