use the obj role for all See Also items

sphinx/ext/napoleon/docstring.py

@@ -1131,6 +1131,11 @@ def _parse_numpydoc_see_also_section(self, content: List[str]) -> List[str]:
         func_name1, func_name2, :meth:`func_name`, func_name3
 
         """
+        try:
+            inventory = self._app.builder.env.intersphinx_inventory
+        except AttributeError:
+            inventory = {}
+
         items = []
 
         def parse_item_name(text: str) -> Tuple[str, str]:
@@ -1151,6 +1156,25 @@ def push_item(name: str, rest: List[str]) -> None:
             items.append((name, list(rest), role))
             del rest[:]
 
+        def search_inventory(inventory, name, hint=None):
+            roles = list(inventory.keys())
+            if hint is not None:
+                preferred = [
+                    role
+                    for role in roles
+                    if role.split(":", 1)[-1].startswith(hint)
+                ]
+                roles = preferred + [role for role in roles if role not in preferred]
+
+            for role in roles:
+                objects = inventory[role]
+                found = objects.get(name, None)
+                if found is not None:
+                    domain, role = role.split(":", 1)
+                    return role
+
+            return None
+
         current_func = None
         rest = []  # type: List[str]
 
@@ -1206,6 +1230,10 @@ def push_item(name: str, rest: List[str]) -> None:
         lines = []  # type: List[str]
         last_had_desc = True
         for func, desc, role in items:
+            if not role:
+                raw_role = search_inventory(inventory, func, hint=func_role)
+                role = roles.get(raw_role, raw_role)
+
             if role:
                 link = ':%s:`%s`' % (role, func)
             elif func_role:

tests/test_ext_napoleon_docstring.py

@@ -1365,6 +1365,7 @@ def test_see_also_refs(self):
 
         config = Config()
         app = mock.Mock()
+        app.builder.env = None
         actual = str(NumpyDocstring(docstring, config, app, "method"))
 
         expected = """\
@@ -1379,6 +1380,27 @@ def test_see_also_refs(self):
 """
         self.assertEqual(expected, actual)
 
+        config = Config()
+        app = mock.Mock()
+        app.builder.env.intersphinx_inventory = {
+            "py:func": {"funcs": (), "otherfunc": ()},
+            "py:meth": {"some": (), "other": ()},
+        }
+        actual = str(NumpyDocstring(docstring, config, app, "method"))
+
+        expected = """\
+numpy.multivariate_normal(mean, cov, shape=None, spam=None)
+
+.. seealso::
+
+   :meth:`some`, :meth:`other`, :func:`funcs`
+   \n\
+   :func:`otherfunc`
+       relationship
+"""
+        self.assertEqual(expected, actual)
+
+
     def test_colon_in_return_type(self):
         docstring = """
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