在深度学习中，激活函数（Activation Function）是神经网络的灵魂。它不仅赋予网络非线性能力，还决定了训练的稳定性和模型性能。那么，激活函数到底是什么？为什么我们非用不可？有哪些经典函数？又该如何选择？
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The former pharmacy worker also lost her spleen, battled pneumonia and developed gallstones which she was told might require further surgery.
Witnesses in Kabul and Kandahar, the southern Afghan city, reported explosions and jets overhead until dawn, while the Taliban government said later that Pakistani surveillance aircraft were still flying over Afghanistan.
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