code: def verify_grad(op, pt, n_tests=2, rng=None, *args, **kwargs):
      if rng is None:
          rng = nr.RandomState(411342)
      at_verify_grad(op, pt, n_tests, rng, *args, **kwargs)
  
imports: import contextlib
  import shutil
  import tempfile
  import warnings
  from logging.handlers import BufferingHandler
  import numpy
  import numpy.random
  import pytensor
  from numpy.testing import assert_array_less
  from pytensor.gradient import verify_grad
  import pymc
  from pymc.testing import fast_unstable_sampling_mode
  from tests.models import mv_simple, mv_simple_coarse
label_desc: Use image node_id 2 for calling a global function with example usage: verify_grad(op, pt, n_tests, rng) without return types