code: def assert_less_threshold(a, b, diff):
      assert all([abs(x - y) < diff for x, y in zip_expand(a, b)])
  
file_path: pyvips/tests/helpers/helpers.py
imports: import os
  import sys
  import tempfile
  import pytest
  import pyvips
label_desc: Use image node_id 9 for calling a global function with example usage: assert_less_threshold(a, b, diff) without return types