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arXiv · 2509.05460

Calibrated Recommendations with Contextual Bandits

Diego Feijer·Himan Abdollahpouri·Sanket Gupta·Alexander Clare·Yuxiao Wen·Todd Wasson·Maria Dimakopoulou·Zahra Nazari·Kyle Kretschman·Mounia Lalmas
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Abstract

Spotify's Home page features a variety of content types, including music, podcasts, and audiobooks. However, historical data is heavily skewed toward music, making it challenging to deliver a balanced and personalized content mix. Moreover, users' preference towards different content types may vary depending on the time of day, the day of week, or even the device they use. We propose a calibration method that leverages contextual bandits to dynamically learn each user's optimal content type distribution based on their context and preferences. Unlike traditional calibration methods that rely on historical averages, our approach boosts engagement by adapting to how users interests in different content types varies across contexts. Both offline and online results demonstrate improved precision and user engagement with the Spotify Home page, in particular with under-represented content types such as podcasts.

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Diego Feijer, Himan Abdollahpouri, Sanket Gupta, Alexander Clare, Yuxiao Wen, Todd Wasson, Maria Dimakopoulou, Zahra Nazari, Kyle Kretschman, Mounia Lalmas. 2025-09-05. Calibrated Recommendations with Contextual Bandits. https://arxiv.org/abs/2509.05460

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