What is Latent semantic indexing (LSI)


Latent semantic indexing ( LSI ) is an indexing and retrieval method that uses a mathematical technique called singular value decomposition (SVD) to identify patterns in the relationships between the terms and concepts contained in an unstructured collection of text.

In simple LSI is an indexing mechanism used by search engines to overcome the keyword queries: multiple words that have similar meaning (synonyms) and words that have more than one meaning (polysemy)