Add Eyüp's changes from CNNArch2MXNet
Some changes regarding loss functions, see https://git.rwth-aachen.de/monticore/EmbeddedMontiArc/generators/CNNArch2MXNet/commit/e1dbf61a9e83fda4145edb9c9e23efc4861b00be
Some changes regarding loss functions, see https://git.rwth-aachen.de/monticore/EmbeddedMontiArc/generators/CNNArch2MXNet/commit/e1dbf61a9e83fda4145edb9c9e23efc4861b00be