code: def _check_reg_match(sss_py, sss_mf, comp_tol):
      """Check regularization."""
      info_py = sss_py.info["proc_history"][0]["max_info"]["sss_info"]
      assert info_py is not None
      assert len(info_py) > 0
      info_mf = sss_mf.info["proc_history"][0]["max_info"]["sss_info"]
      n_in = None
      for inf in (info_py, info_mf):
          if n_in is None:
              n_in = _get_n_moments(inf["in_order"])
          else:
              assert n_in == _get_n_moments(inf["in_order"])
          assert inf["components"][:n_in].sum() == inf["nfree"]
      assert_allclose(
          info_py["nfree"],
          info_mf["nfree"],
          atol=comp_tol,
          err_msg=sss_py._filenames[0],
      )
  
imports: import pathlib
  import re
  from contextlib import contextmanager
  from pathlib import Path
  import numpy
  import pytest
  from numpy.testing import assert_allclose, assert_array_equal
  from scipy import sparse
  from scipy.special import sph_harm
  import mne
  from mne import compute_raw_covariance, concatenate_raws, pick_info, pick_types
  from mne._fiff.constants import FIFF
  from mne.annotations import _annotations_starts_stops
  from mne.chpi import filter_chpi, read_head_pos
  from mne.datasets import testing
  from mne.forward import _prep_meg_channels, use_coil_def
  from mne.io import BaseRaw, read_info, read_raw_bti, read_raw_ctf, read_raw_fif, read_raw_kit
  from mne.preprocessing import annotate_amplitude, annotate_movement, compute_maxwell_basis, find_bad_channels_maxwell, maxwell_filter, maxwell_filter_prepare_emptyroom
  from mne.preprocessing.maxwell import _bases_complex_to_real, _bases_real_to_complex, _get_n_moments, _prep_mf_coils, _sh_complex_to_real, _sh_negate, _sh_real_to_complex, _sss_basis_basic, _trans_sss_basis
  from mne.rank import _compute_rank_int, _get_rank_sss, compute_rank
  from mne.utils import _record_warnings, assert_meg_snr, buggy_mkl_svd, catch_logging, object_diff, use_log_level
label_desc: Use image node_id 15 for calling a global function with example usage: _check_reg_match(sss_py, sss_mf, comp_tol) without return types