3.1. Introduction3.2. Algorithm inspiration3.3. Mathematical modeling3.4. Theoretical fundamentals of feature selection3.5. Mathematical modeling of the feature selection optimization problem3.6. Adaptation of metaheuristics for optimization in a binary search space3.7. Adaptation of the grey wolf algorithm to feature selection in a binary search space3.8. Experimental implementation of bGWO1 and bGWO2 and discussion3.9. Conclusion3.10. References