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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？
First Quarter - Half of the Moon is lit on the right side. It looks like a half-Moon.
In its open letter, OpenAI says it will "continue to strengthen" its law enforcement referral protocol. The company said it's working with mental health experts to better assess difficult cases and when conversations cross the line into being a risk.