code: def test_multiple_cache_files_in_memory(self):
      N = 10000
      sf = _get_data(N)
      self._run_test(sf, sf, "target")
  
file_path: turicreate/src/python/turicreate/test/test_external_memory_tree.py
imports: from __future__ import print_function
  from __future__ import division
  from __future__ import absolute_import
  import unittest
  import turicreate
  from array import array
  import pytest
label_desc: Use image node_id 2 for calling the TreeExtractFeaturesTest obj's underlying member method code with example usage: obj.test_multiple_cache_files_in_memory() without return types