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| TF-IDF× | Aihemallinnus× | |
|---|---|---|
| Tieteenala≠ | Tekstinlouhinta | Syväoppiminen |
| Menetelmäperhe≠ | Process / pipeline | Machine learning |
| Syntyvuosi≠ | 1988 | 1999–2003 |
| Kehittäjä≠ | Salton & Buckley | Hofmann, T. (pLSA, 1999); Blei, D. M., Ng, A. Y., & Jordan, M. I. (LDA, 2003) |
| Tyyppi≠ | Text vectorization / term-weighting scheme | Unsupervised generative probabilistic model |
| Alkuperäislähde≠ | Salton, G. & Buckley, C. (1988). Term-weighting approaches in automatic text retrieval. Information Processing & Management, 24(5), 513-523. DOI ↗ | Blei, D. M., Ng, A. Y., & Jordan, M. I. (2003). Latent Dirichlet Allocation. Journal of Machine Learning Research, 3, 993–1022. link ↗ |
| Rinnakkaisnimet≠ | term weighting, tf-idf weighting, TF-IDF Vektörizasyonu | Latent Semantic Analysis, probabilistic topic modeling, topic discovery, thematic modeling |
| Liittyvät≠ | 3 | 5 |
| Tiivistelmä≠ | TF-IDF, introduced by Salton and Buckley (1988), is a term-weighting scheme that scores each word in a document by how often it appears there and how rare it is across the whole collection. It turns raw text into weighted document vectors, giving high weight to terms that are frequent in one document but uncommon elsewhere. | 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. |
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