code: def __init__(self, model_path=None):
      self.model = None if model_path is None else Detector(model_path)
  
imports: from .detection_model import Detector
  from util.coco.detlabel import COCO_CLASS_DICT
label_desc: Use image node_id 1 to create a new DetInfer object  with example: obj = DetInfer(model_path)