特点：负区间平滑非零，避免 ReLU 死区问题。
// Storage write is slow — meanwhile, the entire stream
。同城约会对此有专业解读
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Ac we nought free ne sindon, for-thy-the we never ne mighton from Wulfsfleet yewitan, nefne we thone Hlaford finden and hine ofslean. Se Hlaford hath thisne stede mid searocraftum yebounden, that none ne may hine forletan. We sindon here swa fuglas on nete, swa fixas on were.