code: def test_create_auto_validation_set_string_session_id(self):
      num_sessions = (
          tc.activity_classifier.util._MIN_NUM_SESSIONS_FOR_SPLIT * 4
      )
      _load_data(
          self,
          num_examples=10000,
          max_num_sessions=num_sessions,
          randomize_num_sessions=False,
          enforce_all_sessions=True,
      )
  
      from six.moves import xrange as _xrange
  
      session_ids_dict = {}
      for i in _xrange(num_sessions):
          session_ids_dict[i] = uuid.uuid4().hex[:6].upper()
  
      self.data[self.session_id] = self.data[self.session_id].apply(
          lambda x: session_ids_dict[x]
      )
  
      self._create_auto_validation_set()
  
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  import random
  import tempfile
  import math
  import numpy
  from numbers import Number
  from .None import util
  import pytest
  from turicreate.toolkits._internal_utils import _mac_ver
  from turicreate.toolkits._main import ToolkitError
  import uuid
label_desc: Use image node_id 7 for calling the ActivityClassifierAutoValdSetTest obj's underlying member method code with example usage: obj.test_create_auto_validation_set_string_session_id() without return types