Fig. 7: Interpreting the AI system.
From: Development and evaluation of an artificial intelligence system for COVID-19 diagnosis

a Visualizing feature maps via Grad-CAM. Notes: two slices of each of three representative subjects are used for the visualization of AI diagnosis. From left to right: original CT image; coarse-resolution attentional regions overlaid on CT image; high-resolution attentional regions with fine granularity; and binarized maps of region of attention obtained from Guided Grad-CAM. b Visualizing features via t-SNE.