code: def where(cond, a, b, use_numexpr=True):
      """evaluate the where condition cond on a and b
  
      Parameters
      ----------
  
      cond : a boolean array
      a :    return if cond is True
      b :    return if cond is False
      use_numexpr : whether to try to use numexpr (default True)
      """
  
      if use_numexpr:
          return _where(cond, a, b)
      return _where_standard(cond, a, b)
  
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 11 for calling a global function with example usage: where(cond, a, b, use_numexpr) and returns: _where_standard, _where