code: def get_intersection(self):
      with self._lock:
          return self.intersection
  
file_path: BigDL/python/ppml/src/bigdl/ppml/fl/psi/psi_intersection.py
imports: import logging
  import threading
  from bigdl.ppml.utils.log4Error import invalidOperationError
label_desc: Use image node_id 4 for calling the PsiIntersection obj's underlying member method code with example usage: obj.get_intersection() and returns: self