[mlpack-git] [mlpack] CF should avoid calculating full matrix when providing recommendations (#406)

[Ryan Curtin]

My linear algebra is wrong.  X.col(i) = W * H.col(i), but it is not true that d(X.col(i), X.col(j)) = d(H.col(i), H.col(j)) unless we make some assumptions about W, which we can't do.  Oops.  Self-assigning until I figure out how this can be done.

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https://github.com/mlpack/mlpack/issues/406#issuecomment-75870146
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