[](https://www.fast.ai/posts/2025-02-20-fasttransform.html#cb10-1)class Normalize(Transform):
[](https://www.fast.ai/posts/2025-02-20-fasttransform.html#cb10-2)    def __init__(self, mean=None, std=None):
[](https://www.fast.ai/posts/2025-02-20-fasttransform.html#cb10-3)        self.mean = mean
[](https://www.fast.ai/posts/2025-02-20-fasttransform.html#cb10-4)        self.std = std
[](https://www.fast.ai/posts/2025-02-20-fasttransform.html#cb10-5)        
[](https://www.fast.ai/posts/2025-02-20-fasttransform.html#cb10-6)    def encodes(self, x): return (x-self.mean) / self.std  # forward transform
[](https://www.fast.ai/posts/2025-02-20-fasttransform.html#cb10-7)    def decodes(self, x): return x*self.std + self.mean    # inverse transform