code: def get_pipeline_response(self, read_op):
      det_op = DetOp(name="det", input_ops=[read_op])
      return det_op
  
file_path: PaddleOCR/deploy/pdserving/web_service_det.py
imports: from paddle_serving_server.web_service import WebService, Op
  import logging
  import numpy
  import cv2
  import base64
  from ocr_reader import OCRReader, DetResizeForTest, ArgsParser
  from paddle_serving_app.reader import Sequential, ResizeByFactor
  from paddle_serving_app.reader import Div, Normalize, Transpose
  from paddle_serving_app.reader import DBPostProcess, FilterBoxes, GetRotateCropImage, SortedBoxes
label_desc: Use image node_id 1 for calling the OcrService obj's underlying member method code with example usage: obj.get_pipeline_response(read_op) and returns: det_op