{"blocks": [{"key": "1e0ba2c7", "text": "Question", "type": "header-two", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}, {"key": "b97f8d85", "text": "Design an end-to-end machine-learning system for a real-time recommendation product. Explain data collection, feature engineering, model training, online serving, monitoring, and scalability considerations.", "type": "unstyled", "depth": 0, "inlineStyleRanges": [], "entityRanges": [], "data": {}}], "entityMap": {}}