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归一化错误导致输入模型的X是错误的。但例子中模型是过拟合的，因此在生成的图里看不出错误。需要仔细阅读代码才可发现。
可以看到源码中，归一化后值是1到50，而修正后为 1.0 到 1.98 以0.02为间隔。这才是真正的输入矩阵X