2. The learning apparatus according to claim 1 , wherein the feature function is formed from the plurality of weak learners that form the tentative learner.
2. The learning apparatus according to claim 1 , wherein the feature function is formed from 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.