<p>In <a href="https://github.com/mlpack/mlpack/pull/391#discussion_r23552501">src/mlpack/core/optimizers/sdp/lrsdp_function.hpp</a>:</p>
<pre style='color:#555'>&gt; @@ -57,110 +73,86 @@ class LRSDPFunction
&gt;                            arma::mat&amp; gradient) const;
&gt;  
&gt;    //! Get the number of sparse constraints in the LRSDP.
&gt; -  size_t NumSparseConstraints() const { return sparseB.n_elem; }
&gt; +  size_t NumSparseConstraints() const { return sdp.NumSparseConstraints(); }
</pre>
<p>I think that is better, but I didn't want to refactor existing code <img class="emoji" title=":smile:" alt=":smile:" src="https://assets-cdn.github.com/images/icons/emoji/unicode/1f604.png" height="20" width="20" align="absmiddle"> </p>

<p>I'll make the changes</p>

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