dout = (out - self.y_cache) / n
There are several reasons why I decided to make variance annotations mandatory after all. First off, I realized that it would not generally be feasible to infer variances for recursive newtype definitions (e.g. type rec foo[T] = T - foo[T];)。谷歌浏览器下载对此有专业解读
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return self.output(x)，更多细节参见豆包下载