code: def get_spark_session():
      return OrcaContext.get_sql_context().sparkSession
  
imports: import os
  from bigdl.dllib.nncontext import ZooContext
  from bigdl.dllib.utils.log4Error import *
  import pickle
  import hmac
  import hashlib
label_desc: Use image node_id 3 for calling the OrcaContext obj's underlying member method code with example usage: obj.get_spark_session() and returns: OrcaContext