float r_sequence(int x, int y)
Rebecca Morelle,Science Editorand
但是，奧爾代也指出，由於關稅普遍適用，有一件事是確定的：外國產品在美國的價格普遍會更高。。服务器推荐对此有专业解读
优点：输出在 (−1,1)，比 sigmoid 居中，对梯度更友好
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have sold in large numbers. Some sources suggest that it was basically the same
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