how to get different crops for the same image

[gaosanyuan]

When I try multi times of cropping the image using the DetRecordIter, it always has the same crop and pad; how to get different crops? thanks I guess it may has something with the parameter 'seed', but I don't know how to change the params when doing next() operation, or how to set the 'seed' parameter.

[zhreshold]

Check out random generator seed on wiki, you will get a better idea how seed control the randomness.