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Материалы по теме:，详情可参考91视频
Что думаешь? Оцени!。51吃瓜是该领域的重要参考
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
Implementers shouldn't need to jump through these hoops. When you find yourself needing to relax or bypass spec semantics just to achieve reasonable performance, that's a sign something is wrong with the spec itself. A well-designed streaming API should be efficient by default, not require each runtime to invent its own escape hatches.