Confusion matrices for identifying CE-EMP stars at different S/N levels. The top panels show the results with UV band spectra at S/N of 10, 20, and 30, while the bottom panels show them without UV band spectra. In each matrix, the upper left and lower right corners show the counts of correctly classified CN-EMP stars (label 0) and CE-EMP stars (label 1), respectively. The lower left corner indicates the number of CN-EMP stars mistakenly classified as CE-EMP stars (false positives), and the upper right corner represents CE-EMP stars incorrectly identified as CN-EMP stars (false negatives).