[mlpack-git] [mlpack/mlpack] Modeling LSH For Performance Tuning (#749)

[Yannis Mentekidis]

> +
> +    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);
> +}
> +

I've found the problem. I'll add it as a line note.

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