[mlpack-git] [mlpack/mlpack] CNE algorithm (#753)

[Marcus Edel]

> +  void Evolve() {
> +    // Generate initial species at random.
> +    int generation = 0;
> +    InitSpecies();
> +    
> +    // Repeat
> +    while (generation < aMaxGeneration) {
> +    	// Evaluate all genomes in the species.
> +      for (int i=0; i<aSpecies.SpeciesSize(); ++i) {
> +        double fitness = aTask.EvalFitness(aSpecies.aGenomes[i]);
> +        aSpecies.aGenomes[i].Fitness(fitness);
> +      }
> +      aSpecies.SetBestFitnessAndGenome();
> +
> +    	// Output some information.
> +      printf("Generation: %zu\tBest fitness: %f\n", generation, aSpecies.BestFitness());

I think it would be better to use Log::Info here, in that case a user can disable any output e.g:

```
Log::Info << "Generation: " << generation << " best fitness: " <<  species.BestFitness() << std::endl
```

or something like that, the important thing is a user can disable the output.

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