Automatic Nonnutritive Suck Waveform Discrimination and Feature Extraction in Preterm Infants
(a) Tsfresh cluster heat map of all 568 NNS files after feature elimination. . Red is positive, green is negative, and blue is unknown. The x-axis represents Tsfresh features, and the y-axis represents NNS assessment file records. The corresponding indexes mapping Tsfresh features (x-axis) and NNS files (y-axis) are saved in these complementary files: “mapping_heatmap_features.xlsx” and “mapping_heatmap_nns.xlsx.” (b) NeoNNS cluster heat map of all NNS files based on 11 NeoNNS features. . All the parameters are the same as used in the Tsfresh cluster heat map.