Lack of image normalization in DiffusionPolicy

[hesic73]

In policy.py, image normalization is applied in both ACTPolicy and CNNMLPPolicy as follows:

        normalize = transforms.Normalize(mean=[0.485, 0.456, 0.406],
                                         std=[0.229, 0.224, 0.225])
        image = normalize(image)

However, this normalization step is missing in DiffusionPolicy. Is this omission intentional? Could you clarify the reasoning behind this difference?