text: from metrics.hvr import HVR, HV
  
  class ZDT1Metrics():
      def HV(self, front):
          return HV([11, 11])(front)
  
      def HVR(self, front):
          return HVR([11, 11], 120 + 2/3)(front)
  
  class ZDT2Metrics():
      def HV(self, front):
          return HV([11, 11])(front)
  
      def HVR(self, front):
          return HVR([11, 11], 120 + 1/3)(front)
  
  class ZDT3Metrics():
      def HV(self, front):
          return HV([11, 11])(front)
  
      def HVR(self, front):
          return HVR([11, 11], 128.77811613069076060)(front)