candidate[n] = closest colour to goal
如果不确定用哪个激活函数，隐藏层可以先用 ReLU，输出层按任务选择；训练中注意梯度情况，如果梯度消失或爆炸，再考虑替换或调整激活函数。
，更多细节参见同城约会
Reports with charts and graphs
He says he was drawn to reinventing Slazenger because of its "interesting history", but that his generation didn't know what it stood for.