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t-SNE of CT images of COVID-19 and other causes of pneumonia on the secondary test dataset. G1 depicted chest CT images of COVID-19 pneumonia with the highest differentiation. G2 represented three cases of false-positive prediction of COVIDNet. G3 pointed out nine cases of false-negative prediction of COVIDNet. CT image manifestations of G1 to G3 were illustrated in Supplementary Table 10.
