[mlpack-git] [mlpack] add a wrapper for the matrix completion SDP (#374)

[Ryan Curtin]

> +                                     const size_t n,
> +                                     const size_t p)
> +{
> +  const size_t mpn = m + n;
> +  float r = 0.5 + sqrt(0.25 + 2 * p);
> +  if (ceil(r) > mpn)
> +    r = mpn; // An upper bound on the dimension.
> +  return ceil(r);
> +}
> +
> +arma::mat MatrixCompletion::CreateInitialPoint(const size_t m,
> +                                               const size_t n,
> +                                               const size_t r)
> +{
> +  const size_t mpn = m + n;
> +  return arma::randu<arma::mat>(mpn, r);

Ah.  Yes.  I forgot about that constructor... no reason to templatize then.

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https://github.com/mlpack/mlpack/pull/374/files#r22746823
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