Douyin's Multimodal Age-Appropriate Algorithms: Engineering Lessons from Recommendation Engines

I noticed an interesting detail: Douyin's upgrade to its minor mode isn't just adding a simple toggle; they've swapped the core engine of the "age-appropriate recommendation algorithm" for a multimodal large language model. As an engineer at BYD who deals with electric drives and battery management daily, my first reaction wasn't "how powerful is this algorithm," but rather "how do you deploy this thing, how do you ensure real-time performance, and how do you control power consumption?"