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。
On Feb. 25 at Samsung Galaxy Unpacked, the brand debuted its newest S Series smartphone: the S26. With its arrival, we expected to see some stellar markdowns on the previous generation, the S25, which has dropped as low as $899.99. Yet, there's an even better deal to shop now, and it's on the new S26.
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优化：随机选基准避免最坏情况 O(n²)
The hoard, which dates to about 50BC and AD50, included five shield bosses and an iron object of unknown origin.
后来，林木通的儿子找到了父亲的照片，发给杜耀豪。令杜耀豪最为惊讶的，是林木通的过度衰老，他去世时只有78岁，但照片里的他，看起来像是90岁老人。