Accuracy is not the sole metric for evaluating recommender systems, as serendipity—the ability to pleasantly surprise users—is also crucial for long-term engagement. While accuracy metrics like NDCG and MAP are widely available and taught, metrics for serendipity are scarce, making them harder to implement and evaluate. Incorporating serendipity can lead to better assortment health and seller diversity by promoting long-tail products, creating a virtuous cycle of user engagement and data collection. AI
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RANK_REASON This is an opinion piece discussing metrics for recommender systems, not a new model release or research paper.