Context

Glossary for BacStage, which predicts engagement for Algerian Bac lessons on YouTube and coaches the creators who make them.

Terms

Bac 3AS video A YouTube video aimed at Algerian students in their final secondary year (3ème année secondaire) preparing for the Baccalauréat exam. The unit the project studies; everything else is filtered out.

Subject The Bac subject a video teaches. Exactly nine: Arabic, English, French, History & Geography, Islamic Sciences, Maths, Natural Sciences, Philosophy, Physics. A channel teaches one subject.

Snapshot One observation of a video's public statistics (views, likes, comments) at a given date. A video accumulates snapshots across collection runs.

Engagement score The number the model predicts for a video. It is derived from a video's statistics, never collected directly.

Planned video A video described before it is published: title, duration, channel or subject, and optionally a description, tags, a planned publish date and a transcript. It has no statistics yet. The predictor scores planned videos.

Caption transcript The text of a video's captions (creator-uploaded or YouTube auto-generated) as downloaded from YouTube.

Whisper transcript Text produced by running Whisper speech-to-text on a downloaded video. Same spoken content as a caption transcript, different origin.

Transcript Either a caption transcript or a Whisper transcript. Use the specific term when the origin matters.

Valid transcript A transcript with real spoken text: non-empty and not a dump of YouTube page code. Only valid transcripts count toward has_transcript and produce transcript features.

Private archive The off-repo, never-public store of transcripts, trained models, and video IDs.