code: def downloadIntersection(self, request, context):
      intersection = self.psi_intersection.get_intersection()
      return DownloadIntersectionResponse(intersection=intersection)
  
file_path: BigDL/python/ppml/src/bigdl/ppml/fl/psi/psi_service.py
imports: import logging
  from random import randint
  from uuid import uuid4
  from bigdl.ppml.fl.psi.psi_intersection import PsiIntersection
  from bigdl.ppml.fl.nn.generated.psi_service_pb2_grpc import *
  from bigdl.ppml.fl.nn.generated.psi_service_pb2 import *
label_desc: Use image node_id 4 for calling the PSIServiceImpl obj's underlying member method code with example usage: obj.downloadIntersection(request, context) and returns: DownloadIntersectionResponse