code: def clear_cycle_mrkrs(self, test=False):
          
          if not test:
              msgBox = QMessageBox(QMessageBox.Question, 'Clear Cycle Markers',
                                   'Are you sure you want to remove all cycle '
                                   'markers for this rater?')
              msgBox.setStandardButtons(QMessageBox.Yes | QMessageBox.No)
              msgBox.setDefaultButton(QMessageBox.Yes)
              response = msgBox.exec_()
  
              if response == QMessageBox.No:
                  return
  
          self.annot.clear_cycles()
  
          self.parent.overview.display()
          self.parent.overview.display_annotations()
docs: Remove all cycle markers.