COOPERATIVE FILTERING METHOD, COOPERATIVE FILTERING DEVICE, COOPERATIVE FILTERING PROGRAM AND RECORDING MEDIUM WITH THE SAME PROGRAM RECORDED THEREON

摘要

PPROBLEM TO BE SOLVED: To provide a cooperative filtering method, a cooperative filtering device, a cooperative filtering program and a recording medium with the program recorded thereon for predicting the unevaluated scores of a user with higher precision than a conventional manner. PSOLUTION: In the cooperative filtering method for predicting the scores of the unevaluated items of a certain user by using an evaluation history including scores evaluated by a plurality of users with a discrete value for a plurality of items, an input data reading part 221 reads a matrix R as input data, a prediction score initial value calculation part 222 substitutes an initial value into the unevaluated scores of the matrix R, a prediction score updating part 223 predicts the unevaluated scores by decreasing the KL divergence of an evaluated score group and unevaluated score group, and a prediction score writing part 224 writes the acquired prediction scores in a storage means 4. PCOPYRIGHT: (C)2008,JPO&INPIT