http://code.google.com/p/semanticvectors/
you probably want to look there and ask questions on the forum there.paul Le 06-avr.-09 à 22:45, Richard Marr a écrit :
Hi Nitin, I'm assuming you're asking about Latent Semantic Indexing and similar. This may not be the best place to ask about this. Not sure where else to suggest though. If I understand your quesion correctly, the basic idea is that you take a document (usually text but it could also be an image, video, whatever) and create a meaningful vector from it. With a text document you could create the vector by specifying each word in your vocabulary as a dimension and defining the position in that dimension as the number of occurences of that word. You can then treat the Euclidian distance between documents as a measure of similarity. Similar documents are clustered together. With images you need different techniques to create the vectors. Different vector creation algorithms create different measures of similarity (colour, shape, etc). I wouldn't say that semantic indexing methods are "different" from the semantic web, because I see them as overlapping concepts. From my perspective the semantic web comprises of many approaches, both top-down (centralised interpretation of meaning like LSI) and bottom-up (manual meta-tagging of data through mark-up, linking, microformats, etc.) Does that help at all? If anyone has corrections, or more to add, please pile in... I'm wearing my flame-retardant underpants :) Rich 2009/4/1 nitin gopi <nitdaii...@gmail.com>:hi all,I want to know everything about semantic vectors. I want to know howdoes it indexes the documents such that the results produced are semantically better than normal search. I also want to know how it is different from semantic web, which uses the concept of ontologies and metadata. It would be very helpful if somebody mail me all the study material related to it? Thanking You Nitin-- Richard Marr richard.m...@gmail.com 07976 910 515 --------------------------------------------------------------------- To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org For additional commands, e-mail: java-user-h...@lucene.apache.org
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