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There are some useful tools or package for IR research , 

I list what I know as below 

Mulan

Mulan can help us to train classifier.

http://mulan.sourceforge.net/index.html

 

LDA (Latent Dirichlet Allocation)

LDA can help us to cluster similar words (or document).

http://chasen.org/~daiti-m/dist/lda/

 

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