Noisy but Wise: How Simple Noise Injection Beats Shortcut Learning in Medical AI
X-rays look clinical. To a neural network, they can also look like stationery. A hospital name in the corner. A scanner signature. A compression pattern. A familiar positioning marker. A slightly different way of cropping the lung field. None of these is pneumonia. None of these is COVID-19. Yet a deep learning model trained on small medical datasets can treat them as wonderfully convenient diagnostic evidence, because machines are very good at passing exams and less naturally committed to understanding what the exam is about. ...