Artificial Intelligence (AI) enables the creation of new branches of intelligent software systems. For example, the virtual makeup try-on tools allow users to narrow their selection before physically trying makeup products. Another example is the automatic form-filling component that converts hand-filled application forms to electronic records. At the core of these AI-enabled systems are deep-learning models that drive the overall process. One critical issue is the maintenance of deployed deep learning models embedded in these systems. What are the steps to maintain deployed models? What are the factors that may affect model maintenance? (25 points)