FIX/DOC: read_ch_adjacency and "picks" argument

doc/changes/devel.rst

@@ -44,6 +44,7 @@ Bugs
 - Fix bugs with :func:`mne.preprocessing.realign_raw` where the start of ``other`` was incorrectly cropped; and onsets and durations in ``other.annotations`` were left unsynced with the resampled data (:gh:`11950` by :newcontrib:`Qian Chu`)
 - Fix bug where ``encoding`` argument was ignored when reading annotations from an EDF file (:gh:`11958` by :newcontrib:`Andrew Gilbert`)
 - Mark tests ``test_adjacency_matches_ft`` and ``test_fetch_uncompressed_file`` as network tests (:gh:`12041` by :newcontrib:`Maksym Balatsko`)
+- Fix bug with :func:`mne.channels.read_ch_adjacency` (:gh:`11608` by :newcontrib:`Ivan Zubarev`)
 - Fix bugs with saving splits for :class:`~mne.Epochs` (:gh:`11876` by `Dmitrii Altukhov`_)
 - Fix bug with multi-plot 3D rendering where only one plot was updated (:gh:`11896` by `Eric Larson`_)
 - Fix bug where subject birthdays were not correctly read by :func:`mne.io.read_raw_snirf` (:gh:`11912` by `Eric Larson`_)

mne/channels/channels.py

@@ -1340,8 +1340,7 @@ def read_ch_adjacency(fname, picks=None):
             You can retrieve the names of all
             built-in channel adjacencies via
             :func:`mne.channels.get_builtin_ch_adjacencies`.
-    %(picks_all)s
-        Picks must match the template.
+    %(picks_all_notypes)s
 
     Returns
     -------
@@ -1401,20 +1400,15 @@ def read_ch_adjacency(fname, picks=None):
 
     nb = loadmat(fname)["neighbours"]
     ch_names = _recursive_flatten(nb["label"], str)
-    picks = _picks_to_idx(len(ch_names), picks)
+    temp_info = create_info(ch_names, 1.0)
+    picks = _picks_to_idx(temp_info, picks, none="all")
     neighbors = [_recursive_flatten(c, str) for c in nb["neighblabel"].flatten()]
     assert len(ch_names) == len(neighbors)
     adjacency = _ch_neighbor_adjacency(ch_names, neighbors)
     # picking before constructing matrix is buggy
     adjacency = adjacency[picks][:, picks]
     ch_names = [ch_names[p] for p in picks]
 
-    # make sure MEG channel names contain space after "MEG"
-    for idx, ch_name in enumerate(ch_names):
-        if ch_name.startswith("MEG") and not ch_name[3] == " ":
-            ch_name = ch_name.replace("MEG", "MEG ")
-            ch_names[idx] = ch_name
-
     return adjacency, ch_names
 
 

mne/channels/tests/test_channels.py

@@ -243,6 +243,25 @@ def test_get_builtin_ch_adjacencies():
         assert len(name_and_description) == 2
 
 
+@pytest.mark.parametrize("name", get_builtin_ch_adjacencies())
+@pytest.mark.parametrize("picks", ["pick-slice", "pick-arange", "pick-names"])
+def test_read_builtin_ch_adjacency_picks(name, picks):
+    """Test picking channel subsets when reading builtin adjacency matrices."""
+    ch_adjacency, ch_names = read_ch_adjacency(name)
+    assert_equal(ch_adjacency.shape[0], len(ch_names))
+    subset_names = ch_names[::2]
+    if picks == "pick-slice":
+        subset = slice(None, None, 2)
+    elif picks == "pick-arange":
+        subset = np.arange(0, len(ch_names), 2)
+    else:
+        assert picks == "pick-names"
+        subset = subset_names
+
+    ch_subset_adjacency, ch_subset_names = read_ch_adjacency(name, subset)
+    assert_array_equal(ch_subset_names, subset_names)
+
+
 def test_read_ch_adjacency(tmp_path):
     """Test reading channel adjacency templates."""
     a = partial(np.array, dtype="<U7")
@@ -262,6 +281,7 @@ def test_read_ch_adjacency(tmp_path):
     savemat(mat_fname, mat, oned_as="row")
 
     ch_adjacency, ch_names = read_ch_adjacency(mat_fname)
+
     x = ch_adjacency
     assert_equal(x.shape[0], len(ch_names))
     assert_equal(x.shape, (3, 3))
@@ -328,11 +348,6 @@ def test_read_ch_adjacency(tmp_path):
     savemat(mat_fname, mat, oned_as="row")
     pytest.raises(ValueError, read_ch_adjacency, mat_fname)
 
-    # Try reading all built-in FieldTrip neighbors
-    for name in get_builtin_ch_adjacencies():
-        ch_adjacency, ch_names = read_ch_adjacency(name)
-        assert_equal(ch_adjacency.shape[0], len(ch_names))
-
 
 def _download_ft_neighbors(target_dir):
     """Download the known neighbors from FieldTrip."""

mne/utils/docs.py

@@ -3358,11 +3358,16 @@ def _reflow_param_docstring(docstring, has_first_line=True, width=75):
 _picks_header = f"picks : {_picks_types}"
 _picks_desc = "Channels to include."
 _picks_int = "Slices and lists of integers will be interpreted as channel " "indices."
-_picks_str = """In lists, channel *type* strings
-    (e.g., ``['meg', 'eeg']``) will pick channels of those
-    types, channel *name* strings (e.g., ``['MEG0111', 'MEG2623']``
-    will pick the given channels. Can also be the string values
-    "all" to pick all channels, or "data" to pick :term:`data channels`.
+_picks_str_types = """channel *type* strings (e.g., ``['meg', 'eeg']``) will
+    pick channels of those types,"""
+_picks_str_names = """channel *name* strings (e.g., ``['MEG0111', 'MEG2623']``
+    will pick the given channels."""
+_picks_str_values = """Can also be the string values "all" to pick
+    all channels, or "data" to pick :term:`data channels`."""
+_picks_str = f"""In lists, {_picks_str_types} {_picks_str_names}
+    {_picks_str_values}
+    None (default) will pick"""
+_picks_str_notypes = f"""In lists, {_picks_str_names}
     None (default) will pick"""
 _reminder = (
     "Note that channels in ``info['bads']`` *will be included* if "
@@ -3373,13 +3378,18 @@ def _reflow_param_docstring(docstring, has_first_line=True, width=75):
 noref = f"(excluding reference MEG channels). {reminder}"
 picks_base = f"""{_picks_header}
     {_picks_desc} {_picks_int} {_picks_str}"""
+picks_base_notypes = f"""picks : list of int | list of str | slice | None
+    {_picks_desc} {_picks_int} {_picks_str_notypes}"""
 docdict["picks_all"] = _reflow_param_docstring(f"{picks_base} all channels. {reminder}")
 docdict["picks_all_data"] = _reflow_param_docstring(
     f"{picks_base} all data channels. {reminder}"
 )
 docdict["picks_all_data_noref"] = _reflow_param_docstring(
     f"{picks_base} all data channels {noref}"
 )
+docdict["picks_all_notypes"] = _reflow_param_docstring(
+    f"{picks_base_notypes} all channels. {reminder}"
+)
 docdict["picks_base"] = _reflow_param_docstring(picks_base)
 docdict["picks_good_data"] = _reflow_param_docstring(
     f"{picks_base} good data channels. {reminder}"