Design a machine learning approach to optimize ad placements on a digital platform.
Instruction: Discuss how you would model the problem, select and engineer features, choose a model, and evaluate its effectiveness in increasing engagement and revenue.
Context: The question evaluates the candidate's ability to apply machine learning to business problems, focusing on revenue optimization and user engagement.
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I would begin by clarifying the platform objective because ad placement can optimize revenue, click-through, conversion, long-term advertiser value, or user experience, and those goals do not always align. Good ad systems are ranking systems under business and marketplace constraints...