Attempt to fix mock imports for rtd

docs/conf.py

@@ -15,18 +15,12 @@
 import sys
 import os
 import mock
-import sys
-from mock import Mock as MagicMock
-
-class Mock(MagicMock):
-    @classmethod
-    def __getattr__(cls, name):
-        return Mock()
 
 MOCK_MODULES = ['numpy', 'scipy', 'joblib', 'nilearn', 'nipype', 'h5py',
-                'sklearn', 'pandas', 'seaborn', 'matplotlib', 'nibabel']
+                'sklearn', 'sklearn.base', 'pandas', 'seaborn', 'matplotlib', 'nibabel']
 
-sys.modules.update((mod_name, Mock()) for mod_name in MOCK_MODULES)
+for mod_name in MOCK_MODULES:
+   sys.modules[mod_name] = mock.Mock()
 
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the