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Comparison of the prediction results of the linear kernel function with other kernel functions in the KPCA-LDA-XGB model. (a) Prediction results of the KPCA(RBF)-LDA-XGB model. (b) Prediction results of the KPCA(Poly)-LDA-XGB model. (c) Prediction results of the KPCA(linear)-LDA-XGB model.
