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Measures of model distances are I 1,2 : extended Kullback-Leibler distance of model 2 from model 1 (equation 6). I 2,1 : extended Kullback-Leibler distance of model 1 from model 2 (equation 6). L 2 : simple L 2 norm (equation 4). L 2w : weighted L 2 norm (equation 5).
