<p>In <a href="https://github.com/mlpack/mlpack/pull/749#discussion_r75930277">src/mlpack/methods/lsh/objectivefunction.hpp</a>:</p>
<pre style='color:#555'>&gt; +
&gt; +    /**
&gt; +     * Parameterized constructor.
&gt; +     *
&gt; +     * @param xData Vector of x - the sizes of the reference set when performing
&gt; +     *    kNN.
&gt; +     * @param kData Vector of k - the kth nearest neighbor for which we
&gt; +     *    calculated the statistic.
&gt; +     * @param yData Matrix of y, one for each (x, k) value.
&gt; +     */
&gt; +    DefaultObjectiveFunction(const arma::Col&lt;size_t&gt;&amp; xData, 
&gt; +                             const arma::Col&lt;size_t&gt;&amp; kData, 
&gt; +                             const arma::mat&amp; yData)
&gt; +      : xData(&amp;xData), kData(&amp;kData), yData(&amp;yData)  { };
&gt; +
&gt; +    //! Return the number of functions
</pre>
<p>If you are only using L-BFGS, you should be able to remove this function. It should only be needed by SGD-like optimizers.</p>

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