Probabilistic Latent Semantic Indexing

作者：Thomas Hofmann · 发表于：ACM SIGIR Forum · 年份：2017 · DOI：10.1145/3130348.3130370 · 被引用次数：4048 · 研究领域：Data Mining Algorithms and Applications、Data Management and Algorithms、Topic Modeling

Probabilistic Latent Semantic Indexing is a novel approach to automated document indexing which is based on a statistical latent class model for factor analysis of count data. Fitted from a training corpus of text documents by a generalization of the Expectation Maximization algorithm, the utilized model is able to deal with domain{specific synonymy as well as with polysemous words. In contrast to standard Latent Semantic Indexing (LSI) by Singular Value Decomposition, the probabilistic variant has a solid statistical foundation and defines a proper generative data model. Retrieval experiments on a number of test collections indicate substantial performance gains over direct term matching methods as well as over LSI. In particular, the combination of models with different dimensionalities has proven to be advantageous.