Convolutional neural network uncertainties of the training sample as a function of CNN output labels. The 2D density distribution in the red colourmap corresponds to the internal precision computed over the 28 CNN models. The green fit corresponds to the running dispersion computed from the residual of CNN-APOGEE training labels (see Fig. 7). The 2D histogram in the blue colourmap corresponds to the quadratic sum of the internal precision and running dispersion, and defines our overall uncertainty.