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。
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Even after building the trillion-dollar tech giant, Apple’s Steve Jobs never pretended to have all the answers. He stayed, as his former design chief put it, genuinely open to learning from other people right up to the end.