LSI and Google?

[member22]

I am wondering if LSI ( latent indexing ) is live and in place at google. I know a little ago they bought a company for that ... but I also read that LSI is very hard to put in place on a large scale and was wondering where they stand on that...

Does anybody have any information ?

[tedster]

LSI is a very specific type of semantic indexing - and it was patented in 1989. Google has definitively stated they do not use that technology.

However, Google definitely DOES use other semantic technology, specifically based on their own patents. See this thread from 2007 to begin your learning about this very deep technology, one which I'm sure they've evolved quite far:

Phrase Based Indexing and Retrieval [webmasterworld.com]