The impact of Coordinate-Wise Monotonic Transformations (CMTs) on age estimation. (IMAGE)
Caption
Four elementary monotonic functions (exponential, logarithmic, square, and sine) were applied immediately after Coordinate-Wise Rank Transformation (CRT) and normalized to [-1, 1] in a coordinate-wise manner. The three circles on the radar plot correspond to the first-order Model Indistinguishability, the second-order Model Indistinguishability and the Mean Absolute Error of the exp(CRT) model (the largest among the four), from the inside out. All models could accurately and consistently estimate ages.
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