Svd, Dimensionality Reduction, Latent Semantic Indexing, Machine Learning, Similarity Search.
which leads to poor precision. The basic observation is that, terms are an unreliable means to assess the relevance of a document, w.r.t to a query, because of synonymy and polisemy. Thus, one would like to represent document using a more semantically accurate way, i.e., in terms of “concepts”.