code: def _assert_mapdata_equal(a, b):
      __tracebackhide__ = True
      assert set(a.keys()) == {"clim", "colormap", "transparent"}
      assert a.keys() == b.keys()
      assert a["transparent"] == b["transparent"], "transparent"
      aa, bb = a["clim"], b["clim"]
      assert aa.keys() == bb.keys(), "clim keys"
      assert aa["kind"] == bb["kind"] == "value"
      key = "pos_lims" if "pos_lims" in aa else "lims"
      assert_array_equal(aa[key], bb[key], err_msg=key)
      assert isinstance(a["colormap"], Colormap), "Colormap"
      assert isinstance(b["colormap"], Colormap), "Colormap"
      assert a["colormap"].name == b["colormap"].name
  
imports: from pathlib import Path
  import matplotlib.pyplot
  import numpy
  import pytest
  from matplotlib.colors import Colormap
  from matplotlib.figure import Figure
  from numpy.testing import assert_allclose, assert_array_equal
  from mne import MixedSourceEstimate, SourceEstimate, convert_forward_solution, make_field_map, make_sphere_model, pick_info, pick_types, read_dipole, read_evokeds, read_forward_solution, read_trans, setup_volume_source_space, use_coil_def
  from mne._fiff._digitization import write_dig
  from mne._fiff.constants import FIFF
  from mne.bem import read_bem_solution, read_bem_surfaces
  from mne.datasets import testing
  from mne.defaults import DEFAULTS
  from mne.io import read_info, read_raw_bti, read_raw_ctf, read_raw_kit, read_raw_nirx
  from mne.minimum_norm import apply_inverse
  from mne.source_estimate import _BaseVolSourceEstimate
  from mne.source_space import read_source_spaces
  from mne.transforms import Transform
  from mne.utils import _record_warnings, catch_logging
  from mne.viz import Brain, EvokedField, Figure3D, link_brains, mne_analyze_colormap, plot_alignment, plot_brain_colorbar, plot_head_positions, plot_source_estimates, plot_sparse_source_estimates, snapshot_brain_montage
  from mne.viz._3d import _get_map_ticks, _linearize_map, _process_clim
  from mne.viz.utils import _fake_click, _fake_keypress, _fake_scroll, _get_cmap
label_desc: Use image node_id 11 for calling a global function with example usage: _assert_mapdata_equal(a, b) without return types