{"blocks": [{"key": "00b928af", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "533f8afc", "text": "Design an online learning or bandit-style recommendation system: at each interaction you must choose 1 item out of 4 candidates to show the user, receive immediate feedback, and update the model so that future selections improve over time. Detail model choice, feature engineering, feedback handling, exploration–exploitation strategy, and offline/online evaluation.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}