Direct encodings usually require simpler implementations than indirect encodings. ... For example, Dasgupta and McGregor (1992) use such an encoding in their method, called Structured Genetic Algorithm (sGA), where a bit string represents the connection matrix of a network. sGA is notable for its simplicity, allowing it to operate almost like a standard GA.

   Dasgupta, D. and McGregor, D. (1992). 
   "Designing application-specific neural networks using the structured genetic algorithm."
   Proceedings of the International Conference on Combinations of Genetic Algorithms and Neural 
   Networks  pp. 87-96. => done