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(A) The example image with a single ulcer lesion on the palatal mucosa. (B) Visualization results of deep learning features extracted by Grad-CAM method based on image A. (C) The true positive output of YOLOV5 detection based on image A. (D) The example image with multiple ulcer lesions on the tongue. (E) Visualization results of deep learning features extracted by Grad-CAM method based on image D. (F) The true positive output of YOLOV5 detection based on image D.
