code: def conf(cls):
      cfg = SparkConf()
      cfg.set("spark.sql.shuffle.partitions", "5")
      return cfg
  
imports: import random
  import shutil
  import string
  import sys
  import tempfile
  import unittest
  from typing import cast
  from pyspark import SparkConf
  from pyspark.sql.streaming.state import GroupStateTimeout, GroupState
  from pyspark.sql.types import LongType, StringType, StructType, StructField, Row
  from pyspark.testing.sqlutils import ReusedSQLTestCase, have_pandas, have_pyarrow, pandas_requirement_message, pyarrow_requirement_message
  from pyspark.testing.utils import eventually
label_desc: Use image node_id 1 for calling the GroupedApplyInPandasWithStateTestsMixin obj's underlying member method code with example usage: obj.conf(cls) and returns: cfg