I'm studing a specific implementation of a recommendation system leveraging on a factorization machine algorithm.
item_id combination, I have an implicit rating of 1 or 0 depending on if the user downloaded the content or not.
In the base model, I have just utilized as input variables the
person_id and the
I selected a latent factor number equal to 5.
In the model output, some of the 5 the latent factors associated to some
item_id are negative, and some predictions of the rating for the combination
item_id are negative too.
I have searched for some theoretical explanations but not found much material, so here I am.
- How a negative latent factor can be explained in this setting?
- Being the training dataset provided with the target variable equal to 1 or 0, how the model end up with negative predictions for the implicit rating?
Many thanks for any hints or material bests