code: def _boundary_inputs(boundary, rtol, atol):
      left = boundary * (1 - numpy.copysign(rtol, boundary)) - atol
      right = boundary * (1 + numpy.copysign(rtol, boundary)) + atol
      return [left, boundary, right]
  
imports: import unittest
  import numpy
  import cupy
  from cupy import testing
  import cupyx.scipy.special
label_desc: Use image node_id 1 for calling a global function with example usage: _boundary_inputs(boundary, rtol, atol) and returns: list