code: def _within_tolerance(x, y, rtol, atol):
      diff = np.abs(x - y)
      z = np.abs(y)
      result = diff <= (atol + rtol * z)
      return result
  
imports: from __future__ import division, print_function, absolute_import
  import warnings
  from collections import namedtuple
  from .None import _zeros
  import numpy
label_desc: Use image node_id 9 for calling a global function with example usage: _within_tolerance(x, y, rtol, atol) and returns: result