code: def orca_context_fixture():
      sc = init_orca_context(cores=8)
  
      spark = SparkSession(sc)
      yield
      stop_orca_context()
  
imports: import pytest
  from bigdl.orca import init_orca_context, stop_orca_context
  from pyspark.sql import SparkSession
label_desc: Use image node_id 1 for calling a global function with example usage: orca_context_fixture() without return types