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Online Learning & Continual Training

Online Learning & Continual Training

Free concept previewThe full case walkthrough and interview practice continue below.

Online Learning & Continual Training

TikTok's recommendation model sees roughly a billion user interactions every day. If that model were retrained once a month, it would be making predictions about what you want to watch right now based on what people were clicking on thirty days ago. That gap, between the world the model learned from and the world it's currently predicting in, is where performance quietly dies.

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Continue Online Learning & Continual Training with the applied case study, diagnostic checks, and the recommendation you would give a PM.

Work through the complete product case
Build the study design step by step
Interpret diagnostics and results
Practice a senior-level interview response

Realistic product cases inspired by

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Dan Lee

Built from a senior data scientist’s perspective

Learn what to check, what to say, and how to make the decision.

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