User Item-Ratings Vector Record

A User Item-Ratings Vector Record is a vector record that contains item ratings for each user.

• Context:
  • It can (often) be a member of of a User Profile Record.
  • It can (typically) be a Sparse Vector.
  • It can (often) be a member of a User-Item Rating Matrix.
• Example(s):
  • { {user_id=97197, item_1_rating=NULL, item_2_rating=4, ..., item_i_rating=NULL}, ...}
  • a User Movie-Ratings Matrix.
  • …
• Counter-Example(s):
  • a User Pages-Visited Record.
• See: Item Catalog.

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References

2016

• Nick Pentreath. (February 2016). “Building a Recommendation Engine with Spark."
  • QUOTE:
    A simple movie-rating matrix

2016a

• (Kumar, 2016) ⇒ Bipul Kumar. (2016). “A Novel Latent Factor Model for Recommender System.” In: Journal of Information Systems and Technology Management (JISTEM), 13(3)
  • QUOTE:
    Figure 2 A schematic diagram for predicting ratings from sparse user-item rating matrix

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