A control unit extracts a plurality of potential features each included in at least one of a plurality of teacher data elements, from the plurality of teacher data elements. The control unit calculates the degree of importance of each potential feature in machine learning on the basis of the frequency of occurrence of the potential feature in the teacher data elements. The control unit calculates the information amount of each teacher data element on the basis of the degrees of importance of the potential features included in the teacher data element. The control unit selects teacher data elements for use in the machine learning from the teacher data elements on the basis of the information amounts of the respective teacher data elements.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. An information processing apparatus comprising: a memory configured to store therein a plurality of teacher data elements; and a processor configured to perform a process including: extracting, from the plurality of teacher data elements, a plurality of potential features each included in at least one of the plurality of teacher data elements; calculating, based on a frequency of occurrence of each of the plurality of potential features in the plurality of teacher data elements, a degree of importance of said each potential feature in machine learning; calculating an information amount of each of the plurality of teacher data elements, using degrees of importance calculated respectively for a plurality of potential features included in said each teacher data element; and selecting a teacher data element for use in the machine learning from the plurality of teacher data elements, based on information amounts of respective ones of the plurality of teacher data elements. 2. The information processing apparatus according to claim 1, wherein the selecting a teacher data element includes selecting a prescribed number of teacher data elements in descending order of information amount or teacher data elements with information amounts larger than or equal to a threshold. 3. The information processing apparatus according to claim 1, wherein the selecting a teacher data element includes generating a first teacher data set and a second teacher data set, the first teacher data set including a first teacher data element and not including a second teacher data element with a smaller information amount than the first teacher data element, the second teacher data set including the first teacher data element and the second teacher data element, and the process further includes obtaining a first result of the machine learning performed on the first teacher data set and a second result of the machine learning performed on the second teacher data set, and searching for a subset including a plurality of teacher data elements that produce a result of the machine learning satisfying a prescribed condition, based on the first result and the second result. 4. An information processing method comprising: extracting, from a plurality of teacher data elements, a plurality of potential features each included in at least one of the plurality of teacher data elements; calculating, based on a frequency of occurrence of each of the plurality of potential features in the plurality of teacher data elements, a degree of importance of said each potential feature in machine learning; calculating an information amount of each of the plurality of teacher data elements, using degrees of importance calculated respectively for a plurality of potential features included in said each teacher data element; and selecting a teacher data element for use in the machine learning from the plurality of teacher data elements, based on information amounts of respective ones of the plurality of teacher data elements. 5. A non-transitory computer-readable storage medium storing a computer to perform a process comprising: extracting, from a plurality of teacher data elements, a plurality of potential features each included in at least one of the plurality of teacher data elements; calculating, based on a frequency of occurrence of each of the plurality of potential features in the plurality of teacher data elements, a degree of importance of said each potential feature in machine learning; calculating an information amount of each of the plurality of teacher data elements, using degrees of importance calculated respectively for a plurality of potential features included in said each teacher data element; and selecting a teacher data element for use in the machine learning from the plurality of teacher data elements, based on information amounts of respective ones of the plurality of teacher data elements.