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| Topic Modeling× | Modello di Topic NMF× | |
|---|---|---|
| Campo | Apprendimento profondo | Apprendimento profondo |
| Famiglia | Machine learning | Machine learning |
| Anno di origine≠ | 1999–2003 | 1999 |
| Ideatore≠ | Hofmann, T. (pLSA, 1999); Blei, D. M., Ng, A. Y., & Jordan, M. I. (LDA, 2003) | Lee, D. D. & Seung, H. S. |
| Tipo≠ | Unsupervised generative probabilistic model | Matrix factorization / unsupervised topic model |
| Fonte seminale≠ | Blei, D. M., Ng, A. Y., & Jordan, M. I. (2003). Latent Dirichlet Allocation. Journal of Machine Learning Research, 3, 993–1022. link ↗ | Lee, D. D., & Seung, H. S. (1999). Learning the parts of objects by non-negative matrix factorization. Nature, 401(6755), 788–791. DOI ↗ |
| Alias | Latent Semantic Analysis, probabilistic topic modeling, topic discovery, thematic modeling | NMF, Non-negative Matrix Factorization, NMF for Topic Modeling, NNMF Topic Model |
| Correlati≠ | 5 | 4 |
| Sintesi≠ | Topic Modeling is a family of unsupervised probabilistic techniques for discovering latent thematic structure in large text collections. By learning which words tend to co-occur, models such as Latent Dirichlet Allocation (LDA) automatically surface coherent topics — each represented as a distribution over vocabulary — without requiring labelled data. | Non-negative Matrix Factorization (NMF) is an unsupervised matrix decomposition method that discovers latent topics in a text corpus by factoring a document-term matrix into two non-negative matrices — one encoding topic-word weights, the other document-topic weights. The non-negativity constraint yields parts-based, additive representations that tend to produce clean, interpretable topics. |
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