System Design · Netflix · Hard
You are the data scientist responsible for a daily promotional notification system on an e-commerce marketplace. Each day, every user must receive a score $$p \in [0,1]$$ representing the probability that the user would make a purchase within the next 7 days if a promo message were delivered today. Only the highest-scoring 20% of users may be contacted. Design the complete modeling system end to end. Labeling and leakage control. Define a correct label from historical logs…
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