EVALUATION PREDICTION DEVICE, EVALUATION PREDICTION METHOD, AND PROGRAM

摘要

PROBLEM TO BE SOLVED: To provide an evaluation prediction device capable of predicting an evaluation value at high speed.SOLUTION: An evaluation prediction device comprises: a posterior distribution calculation part for calculating variational posterior distributions of a first potential vector showing a potential feature of a first item and a second potential vector showing a potential feature of a second item, by regarding each residual matrix Rh of rank h (h=0 to H) in an evaluation value matrix of a rank quantity H that, as factor, has an evaluation value expressed by the first potential vector, the second potential vector and an inner product of the first and second potential vectors, as a random variable following a normal distribution, and by executing a variable Bayesian estimate using a known evaluation value provided as learning data; and an evaluation value prediction part for predicting the evaluation value that is unknown yet, using the variable posterior distribution of the first and second potential vectors that is calculated by the posterior distribution calculation part.