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C4-1三比特奇偶校验写的不对 #1

@Vsingeryh

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@Vsingeryh

学长在c4-1的代码新建了MLP类是想自己写一个bp来求权值,但实际上backforwad的函数写错了,偏导求的不对,所以对w和b的更新都不对。具体可以看我的博客:MLP多层感知机用bp算法更新权值解决异或问题(机器学习实验二)

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