depth 3: test accuracy 0.927, 'fair' with dsr 0.25-0.35 approved by tree: 12 of 18 (policy: 0)
depth 4: test accuracy 0.907, 'fair' with dsr 0.25-0.35 approved by tree: 12 of 18 (policy: 0)
depth 5: test accuracy 0.920, 'fair' with dsr 0.25-0.35 approved by tree: 2 of 18 (policy: 0)
