code: def check_stat(self, check, idata):
      group = idata.posterior
      for var, stat, value, bound in check:
          s = stat(group[var].sel(chain=0), axis=0)
          assert_array_less(np.abs(s.values - value), bound)
  
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 3 for calling the StepMethodTester obj's underlying member method code with example usage: obj.check_stat(check, idata) without return types