Refactor multivariate methods for connectivity classes

mne_connectivity/base.py

@@ -17,6 +17,7 @@
     warn,
 )
 
+from mne_connectivity.spectral.epochs_multivariate import _multivariate_methods
 from mne_connectivity.utils import _prepare_xarray_mne_data_structures, fill_doc
 from mne_connectivity.viz import plot_connectivity_circle
 
@@ -725,7 +726,7 @@ def get_data(self, output="compact"):
         if output == "raveled":
             data = self._data
         else:
-            if self.method in ["mic", "mim", "gc", "gc_tr"]:
+            if self.method in _multivariate_methods:
                 # multivariate results cannot be returned in a dense form as a
                 # single set of results would correspond to multiple entries in
                 # the matrix, and there could also be cases where multiple