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+## BatchNormalization
+
+### $$y = (\hat x - \frac{\hat x_{mean}}{\sqrt{(\hat x_{var}}  + \varepsilon)}) * \gamma + \beta$$
+
+$$\gamma 和\beta$$可学习
+
+[bn可以底消cnn里的bias](https://blog.csdn.net/u010698086/article/details/78046671)
+