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| Fattorizzazione di Matrici Non-Negative (NMF)× | Latent Dirichlet Allocation (LDA)× | |
|---|---|---|
| Campo | Apprendimento automatico | Apprendimento automatico |
| Famiglia | Latent structure | Latent structure |
| Anno di origine≠ | 1999 | 2003 |
| Ideatore≠ | Lee, D. D. & Seung, H. S. | Blei, D. M.; Ng, A. Y.; Jordan, M. I. |
| Tipo≠ | Matrix decomposition with non-negativity constraints | Generative probabilistic topic model (three-level hierarchical Bayesian) |
| Fonte seminale≠ | Lee, D. D., & Seung, H. S. (1999). Learning the parts of objects by non-negative matrix factorization. Nature, 401(6755), 788–791. DOI ↗ | Blei, D. M., Ng, A. Y., & Jordan, M. I. (2003). Latent Dirichlet allocation. Journal of Machine Learning Research, 3, 993–1022. DOI ↗ |
| Alias | NMF, NNMF, nonnegative matrix factorization, non-negative matrix approximation | LDA, topic model, Blei-Ng-Jordan model, probabilistic topic modeling |
| Correlati≠ | 4 | 3 |
| Sintesi≠ | Non-negative Matrix Factorization (NMF) is a family of algorithms, introduced by Lee and Seung in their landmark 1999 Nature paper, that decomposes a non-negative data matrix V into the product of two lower-rank non-negative matrices W (basis components) and H (encoding coefficients). Unlike PCA or SVD, the non-negativity constraint forces the algorithm to learn strictly additive, parts-based representations, making the factors directly interpretable as building blocks of the original data. | Latent Dirichlet Allocation (LDA) is a generative probabilistic model for collections of discrete data, introduced by Blei, Ng, and Jordan in 2003. It treats each document as a mixture of latent topics and each topic as a probability distribution over words, enabling unsupervised discovery of thematic structure across large text corpora. It is one of the most cited papers in machine learning and natural language processing. |
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