Value of "pixel_mean" and "pixel_std"

[chenpengxin]

This is a great job!

I noticed the hard-coded value of "pixel_mean" and "pixel_std" at https://github.com/htcr/sam_road/blob/main/model.py#L227 . I wonder why the cityscale and spacenet share the same values? Could you please give a suggestion of how to set these two values for my customized dataset?

Thanks!