<p>In <a href="https://github.com/mlpack/mlpack/pull/749#discussion_r76079505">src/mlpack/methods/lsh/objectivefunction.hpp</a>:</p>
<pre style='color:#555'>> +
> + double gammaChain =
> + - 2.0 * alpha * std::pow(k, beta) * std::log(x) * std::pow(x, gamma);
> +
> + // 3x1 column vector (in matrix form).
> + gradient(0, 0) += error * alphaChain;
> + gradient(1, 0) += error * betaChain;
> + gradient(2, 0) += error * gammaChain;
> + }
> +
> + // Return the average of each gradient after the summation is complete.
> + gradient(0, 0) /= ((double) M);
> + gradient(1, 0) /= ((double) M);
> + gradient(2, 0) /= ((double) M);
> +}
> +
</pre>
<p>I've found the problem. I'll add it as a line note.</p>
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