code: def evaluate_detections(self, detections):
          
          # make all these folders for results
          result_dir = os.path.join(self.devkit_path, 'results')
          if not os.path.exists(result_dir):
              os.mkdir(result_dir)
          year_folder = os.path.join(self.devkit_path, 'results', 'VOC' + self.year)
          if not os.path.exists(year_folder):
              os.mkdir(year_folder)
          res_file_folder = os.path.join(self.devkit_path, 'results', 'VOC' + self.year, 'Main')
          if not os.path.exists(res_file_folder):
              os.mkdir(res_file_folder)
  
          self.write_pascal_results(detections)
          self.do_python_eval()
docs: top level evaluations
          Parameters:
          ----------
          detections: list
              result list, each entry is a matrix of detections
          Returns:
          ----------
              None