code: def set_use_numexpr(v=True):
      # set/unset to use numexpr
      global _USE_NUMEXPR
      if _NUMEXPR_INSTALLED:
          _USE_NUMEXPR = v
  
      # choose what we are going to do
      global _evaluate, _where
      if not _USE_NUMEXPR:
          _evaluate = _evaluate_standard
          _where = _where_standard
      else:
          _evaluate = _evaluate_numexpr
          _where = _where_numexpr
  
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 1 for calling a global function with example usage: set_use_numexpr(v) without return types