I often find myself padding an array to do some processing on it (i.e. to avoid edge artifacts), then I need to remove the padding. I wish there was either a built in "unpad" function that accepted the same arguments as "pad", or that "pad" accepted negative numbers (e.g [-20, -4] would undo a padding of [20, 4]). This seems like a pretty obvious feature to me so maybe I've just missed something, but I have looked through all the open and closed issues on github and don't see anything related to this.
Jeff G
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