Hammers and nails

We do research just as using hammers for nails.

Just for fun, I collected so many hammers and nails as follows.
I thought we should be familiar very much with the characteristics and particularity for each hammer, and try to understand the situation of each nail. Too our NLP&IR research, the hammers were all kiinds of machine learning methods and mathematics. The nails were the concrete problem of NLP and IR.

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