3. The learning apparatus according to claim 2 , wherein the learner generating means uses, as the feature function, a linear sum of any number of the weak learners among the plurality of weak learners that form the tentative learner.
3. The learning apparatus according to claim 2 , wherein the learner generating means uses, as the feature function, a linear sum of any number of the weak learners among the plurality of weak learners that form the tentative learner. 4. The learning apparatus according to claim 3 , wherein the learner generating means generates any number of a plurality of the features using a plurality of the corresponding feature functions, and wherein the number of the weak learners that form each of the feature functions differs.