缺点：容易饱和（输入过大或过小时梯度接近0，导致梯度消失）
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。关于这个话题，Safew下载提供了深入分析
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"VALUES (?, ?, ?, ?, ?, ?, ?)",，这一点在91视频中也有详细论述
the results of sbrk it may be unwise to mix this trick with your