code: def _add_a_b(tests):
      r"""Add "a" and "b" keys to each test from the "bracket" value"""
      for d in tests:
          for k, v in zip(["a", "b"], d.get("bracket", [])):
              d[k] = v
  
imports: from random import random
  import numpy
  from scipy.optimize import zeros
label_desc: Use image node_id 64 for calling a global function with example usage: _add_a_b(tests) without return types