code: def proposals_si(self):
      return self.proposals_si
  
file_path: CNTK/Examples/Image/Detection/utils/od_mb_source.py
imports: from cntk.io import UserMinibatchSource, StreamInformation, MinibatchData
  from cntk.core import Value
  from utils.od_reader import ObjectDetectionReader
  import numpy
label_desc: Use image node_id 6 for calling the ObjectDetectionMinibatchSource obj's underlying member method code with example usage: obj.proposals_si() and returns: self