need help designing a neural network

i am working on a project and intend to use neural network to determine document relevance to query feed forward

using c# and VS 2008 and Afroge

how do i go about it
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First you must decide which kind of neural net you need... which kind of learning... can you be more specific ?
uddyAuthor Commented:
sorry about that
i want to use a feed-forward neural network of back-propagation with unsupervised learning

using C# and VS 2008


Can I suggest the reading of this great introductory article?

also, check the documentation:
Piece of advice:  Neural Networks sound great in theory but are hard to get working properly, the devil is in their details. The training through back propagation can require untold thousands of test inputs.  If you have another way of measuring similarity, use it.

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uddyAuthor Commented:
well all answers made me look at the theory the do the work
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