[mlpack-git] [mlpack] [Proposal]Add a function to visualize the results of sparse_autoencoder (#452)

[Ryan Curtin]

Let's put it in `methods/sparse_autoencoder` for now; it can be moved later.  The idea of a global function sounds good, but please consider naming `w1()` something more descriptive, like `Parameters()` (since the internal member is named `parameters`).

Why do you transpose in the input to `MaximalInput()`?  If that could be avoided, the function could be a little bit faster (possibly).

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https://github.com/mlpack/mlpack/issues/452#issuecomment-151157007
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