5. The method of claim 4 , wherein the projection operation includes an operation of multiplying each weighted value to elements in each of the multidimensional feature vectors ci+j and an operation of averaging the elements element-wisely across the multidimensional feature vectors ci+j.
5. The method of claim 4 , wherein the projection operation includes an operation of multiplying each weighted value to elements in each of the multidimensional feature vectors ci+j and an operation of averaging the elements element-wisely across the multidimensional feature vectors ci+j. 6. The method of claim 5 , wherein the weighted value is set differently for each of the multidimensional feature vectors ci+j.