Is there any open source implementation of LSI in Java? I want to use that library for my project. I have seen jLSI but it implements some other model of LSI. I want a standard model.
Any Latent Semantic Indexing?
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The S-Space Package has an open source version of LSA, with bindings for the LSI document vectors. (Both approaches operate on the same term-document matrix and are equivalent except in the output.) It's a fairly scalable approach that uses the thin-SVD. I've used it to run LSI on all of Wikipedia with no issue (after removing the infrequent terms with less than 5 occurrences).
As Scott Ray mentioned, the SemanticVectors package also has a good LSI implementation that recently switched to using the same thin-SVD (SVDLIBJ), so you might check that out as if you hadn't before.
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I believe that LSA/LSI was patented in 1989, which means the patent should have just expired. Hopefully we will see some nice open source applications soon.
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A google search for java LSI leads to a similar question that recommends SemanticVectors. A package built on top of Lucene that is 'similar' to LSI. I don't know if it's closer than the jLSI implementation.
That thread also mentions that LSI is patented and there aren't a lot of implementations of it. So if you need a standard implementation you may have to use a language other than java.
Have you considered LDA (Latent Dirichlet allocation)? I haven't really either, but I encountered the same problem with LSI recently (patents). From what I understand LDA is a related/more powerful technique. http://en.wikipedia.org/wiki/Latent_Dirichlet_allocation apparently has some links to open-source implementations.