# get only the inner shape for reduction reduce_axis = ShapeAPI(X.shape).select(axis).to_tuple() return NDArray( outshape, X.dtype, lambda k: sqrt( LoopNestAPI.from_tuple(reduce_axis) .unwrap() .fold(lambda carry, i: carry + real(conj(x := X[i + k]) * x), init=0.0) )...
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