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4. Why BN? 好了，现在才是重头戏－－为什么要用BN？ BN work的原因是什么？ 说到底，BN的提出还是为了克服深度神经网络难以训练的弊病。 其实BN背后的insight非常简单，只是在文 …

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具体要看是什么激活函数 Sigmoid：如果先BN再Sigmoid，由于BN后方差接近于1，均值接近于0，使得BN后的数据接近于Sigmoid的线性区域，降低了激活函数的非线性能力，这种情况下 …