code: def _float_approx_equal(x, y, tol=1e-18, rel=1e-7):
      if tol is rel is None:
          raise TypeError(
              "cannot specify both absolute and relative errors are None"
          )
      tests = []
      if tol is not None:
          tests.append(tol)
      if rel is not None:
          tests.append(rel * abs(x))
      assert tests
      return abs(x - y) <= max(tests)
  
label_desc: Use image node_id 1 for calling a global function with example usage: _float_approx_equal(x, y, tol, rel) and returns: unknown