Support sphinx v4 (#3622)

docs/en_US/builtin_tuner.rst

@@ -10,9 +10,7 @@ Tuner receives metrics from `Trial` to evaluate the performance of a specific pa
     :maxdepth: 1
     
     Overview <Tuner/BuiltinTuner>
-    TPE <Tuner/HyperoptTuner>
-    Random Search <Tuner/HyperoptTuner>
-    Anneal <Tuner/HyperoptTuner>
+    TPE / Random Search / Anneal <Tuner/HyperoptTuner>
     Naive Evolution <Tuner/EvolutionTuner>
     SMAC <Tuner/SmacTuner>
     Metis Tuner <Tuner/MetisTuner>

docs/en_US/conf.py

@@ -201,4 +201,4 @@ extlinks = {
 
 # -- Extension configuration -------------------------------------------------
 def setup(app):
-    app.add_stylesheet('css/custom.css')
+    app.add_css_file('css/custom.css')

docs/requirements.txt

-sphinx>=3.3.1
+sphinx>=4.0
 sphinx-argparse
 sphinx-rtd-theme
 sphinxcontrib-websupport

nni/algorithms/hpo/networkmorphism_tuner/networkmorphism_tuner.py

@@ -225,7 +225,7 @@ class NetworkMorphismTuner(Tuner):
         ----------
         other_info: any object
             In our case it is the father ID in the search tree.
-        graph: Graph
+        graph: graph.Graph
             An instance of Graph. The trained neural architecture.
         metric_value: float
             The final evaluated metric value.
@@ -284,7 +284,7 @@ class NetworkMorphismTuner(Tuner):
 
         Returns
         -------
-        load_model : Graph
+        load_model : graph.Graph
             the model graph representation
         """
 
@@ -300,7 +300,7 @@ class NetworkMorphismTuner(Tuner):
 
         Returns
         -------
-        load_model : Graph
+        load_model : graph.Graph
             the model graph representation
         """
         return self.load_model_by_id(self.get_best_model_id())