2. (10 points) Write out the 3-nearest neighbor classifier for a feature x R based on the following training points: 2, 23) 3,)-1 (4) - 1,y r)0,y)-1. Hint: the classifier shall have the following form with the threshold c to be determined. -1, if 2c 2. (10 points) Write out the 3-nearest neighbor classifier for a feature x R based on the following training points: 2, 23) 3,)-1 (4) - 1,y r)0,y)-1. Hint: the classifier shall have the following form with the threshold c to be determined. -1, if 2c