code: def set_test_mode(v=True):
      """
      Keeps track of whether numexpr was used.  Stores an additional ``True``
      for every successful use of evaluate with numexpr since the last
      ``get_test_result``
      """
      global _TEST_MODE, _TEST_RESULT
      _TEST_MODE = v
      _TEST_RESULT = []
  
file_path: catboost/contrib/python/pandas/py2/pandas/core/computation/expressions.py
imports: import warnings
  import numpy
  from pandas.core.dtypes.generic import ABCDataFrame
  import pandas.core.common
  from pandas.core.computation.check import _NUMEXPR_INSTALLED
  from pandas.core.config import get_option
label_desc: Use image node_id 12 for calling a global function with example usage: set_test_mode(v) without return types