优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
Marine groups have recommended a cut in the amount of North East Atlantic mackerel being caught to prevent a collapse in population numbers.
，更多细节参见搜狗输入法2026
Фото: Mindaugas Kulbis / AP
"It is really, really hard," he said.
a good memory allocation strategy. We can usually find another data