code: def is_close(a, b, rel_tol=1e-09, abs_tol=0.0):
      # Check if float numbers are basically equal, for python >=3.5 there is
      # function for that in the standard library
      return abs(a - b) <= max(rel_tol * max(abs(a), abs(b)), abs_tol)
  
imports: import math
  import pytest
  import networkx
  from networkx.algorithms.planar_drawing import triangulate_embedding
label_desc: Use image node_id 15 for calling a global function with example usage: is_close(a, b, rel_tol, abs_tol) and returns: unknown