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(A) Histogram of BMD. The left and right vertical axes denote the numbers (frequencies) of training samples and test samples, respectively. The horizontal axis denotes BMD and the bin width is .1. The number above every bar represents the percentage ratio. (B) Weight used for the loss function in Eq. 1. The weight curve over BMD is associated with the inverse of the curve fitting to the distribution of training samples in the histogram.
