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import nifty4 as ift
import numpy as np
np.random.seed(42)
x = ift.RGSpace((8, 8))
f = ift.Field.from_random(domain=x, random_type='normal')
diagOp = ift.DiagonalOperator(f)
diag = ift.probe_diagonal(diagOp, 1000) ift.dobj.mprint((f - diag).norm())
