code: def _is_power_of_2(n):
      from pyopencl.tools import bitlog2
  
      return n == 0 or 2 ** bitlog2(n) == n
  
file_path: pyopencl/pyopencl/bitonic_sort.py
imports: import pyopencl
  from pyopencl.tools import dtype_to_ctype
  from operator import mul
  from functools import reduce
  from pytools import memoize_method
  from mako.template import Template
  import pyopencl.bitonic_sort_templates
label_desc: Use image node_id 1 for calling a global function with example usage: _is_power_of_2(n) and returns: unknown