Introduction on Chen Kai Bloghttps://www.chenk.top/en/tags/introduction/Recent content in Introduction on Chen Kai BlogHugoenMon, 01 Dec 2025 09:00:00 +0000Recommendation Systems (1): Fundamentals and Core Conceptshttps://www.chenk.top/en/recommendation-systems/01-fundamentals/Mon, 01 Dec 2025 09:00:00 +0000https://www.chenk.top/en/recommendation-systems/01-fundamentals/<p>Open Netflix and the homepage somehow knows you. Scroll TikTok and the next video is the one you didn&rsquo;t realise you wanted. Drop into Spotify on a Monday morning and <em>Discover Weekly</em> serves up thirty songs you&rsquo;ve never heard of, and you save half of them.</p> <p>None of this is magic. It is one of the most commercially successful applications of machine learning, quietly running behind almost every consumer product you use: the <strong>recommendation system</strong>.</p>