Define a recommendation system by its user job, decision moment, and success signal before selecting a model.
The move: write the recommender's job before you write the model objective. Actor and trigger A recommendation happens at a moment of choice. Name the person and the trigger. A learner opening an app at 8:40 before a commute is not the same as a procurement manager reviewing suppliers after a failed delivery. The trigger tells you what kinds of recommendations will feel useful instead of intrusive. Progress, not preference Preference is only a proxy. A user may click a video because it is sensational, familiar, or easy, while the real job is to recover focus, compare vendors, find a…
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