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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The boar's head standard was made from sheet bronze. It would have been held aloft in battle like a flag and used as a rallying point for troops.。夫子对此有专业解读
Фото: Stringer / Reuters
A Roman coin unearthed during HS2 archaeological digs is now being held in a secret store