优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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。搜狗输入法2026对此有专业解读
输入：["StockSpanner","next","next","next","next","next","next","next"], [[],[100],[80],[60],[70],[60],[75],[85]]
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// The string is stored in Wasm memory, but we need to