优点:计算简单,导数恒为1(正区间),缓解梯度消失
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Жители Санкт-Петербурга устроили «крысогон»17:52
that developed into the IBM Systems Network Architecture, or SNA, basically
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The move brings the UK into line with other countries which already offer routine varicella vaccination, including Germany, Canada, Australia and the US.