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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In a letter to its customers, Heraeus Medical said it had experienced a critical machine failure at its main site when it was in the process of upgrading its production processes.
Police had previously said that they discovered Rivas Hernandez's remains inside the boot of the impounded car after responding to reports of a foul odour at the Hollywood tow yard.