Generative Model, Discriminative Model.
predictions, conditional distribution P(y|x) is enough. But since P(y|x) = P(y, x) / P(x), where P(x) is constant for the given x and all possible y, it is valid to use joint distribution P(y, x) to make predictions. By modelling joint distribution P(y, x) is meant that for each pair (yᵢ, xᵢ) a