72results about How to "Avoid computational overhead" patented technology

The invention provides a multi-objective recommendation optimization method and a readable medium. The method comprises the following steps: initializing a plurality of decision vector families according to the number of to-be-recommended items and the number of recommended items; constructing a first objective function, a second objective function, a third objective function and a fourth objective function related to the decision vector families, wherein the first objective function is used for calculating the accuracy of the decision vectors, the second objective function is used for calculating the diversity of the decision vectors, the third objective function is used for calculating the novelty of the decision vectors, and the fourth objective function is used for calculating the coverage rate of the decision vector; constructing a final target function related to the decision vector family according to the first target function, the second target function, the third target function and the fourth target function; substituting the decision vector into the final target function to obtain a target function vector; comparing the target function vector to obtain a non-dominated solution set; generating a recommendation scheme of the to-be-recommended project according to the non-dominated solution set; and recommending the project to the target user according to the recommendation scheme.

The invention relates to a device for applying flowable material to a substratum (3), which can be rotated about an axis of rotation (4), in accordance with specified image data, which are stored as pixels or as vectors of a certain Cartesian coordinate grid in a first memory (18), has at least one printing head (13A, 13B), which has a plurality of nozzles arranged at a nozzle distance from each other for discharging material drops of the flowable material and is arranged at a vertical distance from the substratum, and a controller (8) for positioning the substratum (3) in relation to the at least one printing head (13A, 13B) and the discharge of the material drops. In a second memory (19), particular polar coordinate grid points (20A, 20B) of a certain polar coordinate grid are stored, which polar coordinate grid points are arranged on circular lines (R1, R2) having a predetermined circular-line distance from each other and are arranged on first rays (A1), which have a first angular distance from each other and are arranged in the direction of origin on further rays (A2) having an angular distance from each other that is greater than the first angular distance. A computer (15) ispresent, by means of which the particular polar coordinate grid points (20A, 20B) stored in the second memory (19) can be transformed into coordinates of the certain Cartesian coordinate system and the Cartesian grid points thus obtained are compared with the pixels of the image file.