INFORMATION PROCESSING APPARATUS INFORMATION PROCESSING METHOD, AND INFORMATION PROCESSING PROGRAM

1 . An information processing apparatus comprising:

an acquisition unit configured to acquire action history data for each user and a condition when optimizing an incentive measure;

a parameter estimation unit configured to estimate a parameter value of an action model for the each user on the basis of the action history data;

an optimization unit configured to calculate an optimum incentive measure for the each user on a basis of the estimated parameter value and the condition; and

an output unit configured to output the optimum incentive measure.

2 . The information processing apparatus according to claim 1 , wherein

the action history data includes a sequence of incentive amounts at each observation time for the each user, and

the parameter estimation unit estimates the parameter value of the action model for the each user, the action model having the sequence of incentive amounts as an input and an achievement level for a targeted action for the each user as an output.

3 . The information processing apparatus according to claim 2 , wherein

the action history data further includes an observation value of a target action obtained by evaluating success or failure of the targeted action at each observation time for the each user, and an explanatory variable that is information that affects the targeted action at each observation time for the each user, and

the action model for the each user includes, as internal variables, a self-efficacy that varies with time depending on success or failure of a past action and a motivation that determines success or failure of the target action, and the motivation is determined by the self-efficacy, a function that represents sensitivity to the incentive amount for the each user, and a function that represents an influence level on the explanatory variable.

4 . The information processing apparatus according to claim 3 , wherein, in the action model for the each user, an action at each observation time for the each user is larger than 0 and smaller than 1, and the action model is probabilistically generated from a binomial distribution represented by a non-negative function having the motivation as the internal variable, and the parameter estimation unit estimates the parameter value of the action model for the each user on the basis of a maximum likelihood estimation method.

5 . The information processing apparatus according to claim 4 , wherein the condition includes a length of a target period, a total budget used for an incentive in the target period, a sequence of the explanatory variables in the target period, and an objective function that evaluates optimality of an incentive measure, the incentive measure is a function that has time, the self-efficacy at the time, a remaining budget of the total budget available for the incentive measure, and the explanatory variable as inputs, and outputs the incentive amount presented at the time, and the optimum incentive measure is an incentive measure that maximizes an expected value of the objective function.

6 . The information processing apparatus according to claim 5 , wherein, in a Markov decision process in which a state at the time includes the self-efficacy, the remaining budget, the explanatory variable, and an observation value of the action, the observation value of the target action when the incentive amount is presented at the time is probabilistically generated according to the binomial distribution, a possible value of the incentive amount is equal to or less than the remaining budget, and transition is performed with a probability of 1 from the time to next time, the optimization unit calculates the optimum incentive measure by solving a Bellman optimization equation.

7 . An information processing method executed by an information processing apparatus including a processor, the information processing method comprising:

acquiring, by the processor, action history data for each user;

acquiring, by the processor, a condition when optimizing an incentive measure;

estimating, by the processor, a parameter value of an action model for the each user on the basis of the action history data;

calculating an optimum incentive measure for the each user on the basis of the estimated parameter value and the condition; and

outputting, by the processor, the optimum incentive measure.

8 . A non-transitory computer readable storage medium storing a computer program which is executed by an information processing apparatus to provide the steps of:

acquiring, by a processor, action history data for each user;

acquiring, by the processor, a condition when optimizing an incentive measure;

estimating, by the processor, a parameter value of an action model for the each user on the basis of the action history data;

calculating an optimum incentive measure for the each user on the basis of the estimated parameter value and the condition; and

outputting, by the processor, the optimum incentive measure.