[mlpack-git] [mlpack] Create a function to visualize the features learned by sparse autoencoder (#465)

[Ryan Curtin]

It's an Armadillo versioning issue with this line:

```
double const max = arma::abs(input.row(k)).max();
```

Try `arma::max(arma::abs(input.row(k)))`.  I'm not sure in what version the `.max()` function was added to arbitrary expressions, but either way both of those expressions should compile to the same thing, and the `arma::max()` version should compile on older Armadillo versions.  (I'll be bumping the minimum Armadillo required version to 4.200 or so soon, I just haven't gotten around to it yet.)

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Reply to this email directly or view it on GitHub:
https://github.com/mlpack/mlpack/pull/465#issuecomment-151489477
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