激活函数的作用 激活函数在每个神经元输出前进行非线性变换，让网络可以拟合复杂的函数关系，从而解决分类、回归等非线性问题。
The mission has already faced years of delays, and Nasa is under pressure to get the astronauts on their way as soon as possible. However, the US space agency said it would not compromise on safety.
。51吃瓜是该领域的重要参考
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