Fig. 2: The structured attention graphs (SAGs) of classification results from the raw CNN classifier trained by the raw data.

a a 3D-EEM spectrum containing four fluorescent components was classified as four fluorescent components; b a 3D-EEM spectrum containing three fluorescent components was classified as five fluorescent components. c a 3D-EEM spectrum containing three fluorescent components was classified as five fluorescent components. Three 3D-EEM spectra were randomly selected from the training dataset.