code: def inverse(self, vector, duration=None):
          '''Inverse vector transformer'''
  
          ann = jams.Annotation(namespace=self.namespace, duration=duration)
  
          if duration is None:
              duration = 0
          ann.append(time=0, duration=duration, value=vector)
  
          return anf inverse(self, vector, duration=None):
          '''Inverse vector transformer'''
  
          ann = jams.Annotation(namespace=self.namespace, duration=duration)
  
          if duration is None:
              duration = 0
          ann.append(time=0, duration=duration, value=vector)
  
          return ann
docs: Inverse vector transformer