A Proposal for Continuous Evaluation-based Interactive Evolutionary Computation

Abstract

Interactive Evolutionary Computation (IEC) is known as an efficient method which reflects user's subjective preference on media contents. However, user's fatigue caused by repetitive evaluation tasks remains as a severe problem in IEC. The purpose of this study is to propose a new framework of IEC, continuous evaluation-based IEC (CEIEC) that continues user's evaluation tasks in many days. CEIEC allows the user's subjective evaluation day by day to have many evaluation times without severe fatigue, while conventional IECs performed user's task in one time in one day. This study also performed a listening experiment for investigating efficiencies of CEIEC. The target of search with CEIEC was to design a bright sign sound. Sixteen subjects participated in the listening experiment which is composed of tasks of three days: in the 1st and the 2nd days, the subjects performed a selection task throughout fifteen generations. Successive update of the solution was observed during these two days. In the 3rd day, the subjects evaluated three sign sounds with 7-point scale. These three sounds were picked up from the 0th, 14th, and 29th generations, respectively. The sound with the highest score was found in the 29th generation. These results show the efficiencies of CEIEC.

Investigation of the efficiency of continuous evaluation‐based interactive evolutionary computation for composing melody

“…The number of parameters was eight, and the number of solution candidates (DE vectors) was fixed as eight in all the generations. Parameters of DE, the scale factor, and the crossover probability, were set as F = 0.9 and Cr = 0.6 respectively by referring to the previous studies .…”

“…Can we turn the idea of the work efficiency into the task of IEC? Based on the idea about the user's attention span, we have proposed a framework of IEC that divides the user's evaluation tasks in IEC in many days: we called this method continuous evaluation‐based IEC (CEIEC) . The CEIEC allows the user's subjective evaluation day by day to have many evaluation times without accumulating severe fatigue, while the conventional IECs make users complete their task in 1 day.…”

“…The purpose of this study is to show the further efficiencies of the CEIEC by comparing with a general IEC where all the user's task is finished in 1 day. The previous study of the CEIEC divided the task into 2 days . The efficiencies of dividing the evaluation task of IEC in terms of shrink of search space and shortening of elapsed time for the user's task have not been investigated.…”

“…The efficiencies of dividing the evaluation task of IEC in terms of shrink of search space and shortening of elapsed time for the user's task have not been investigated. As same as the previous study , we conducted listening experiments for creating short 'bright' sounds composed of music melody. As indices for comparison, the subjective fitness value for the created sound, a number of updates of solution candidates, shrink of search space, and elapsed time for the subjective evaluation were used.…”