The DRAGON program was used to calculate 9600 samples, and the nuclide densities of 235U, 238U, 239Pu, 241Pu, 137Cs, 244Cm and 154Nd nuclides were used as the prediction parameters. Linear regression model, regression tree model constructed based on decision tree, multilayer perception (MLP) model and random forest model were selected to carry out model training. Pearson correlation coefficient (PCC), mean absolute error (MAE), relative absolute error (RAE) and relative root mean square error (RRSE) were chosen to evaluate the fitting effect of...