Merge pull request #3030 from microsoft/v2.0

Merge v2.0 into master

src/sdk/pynni/nni/nas/pytorch/mutator.py → nni/nas/pytorch/mutator.py

@@ -107,7 +107,7 @@ class Mutator(BaseMutator):
         """
         if not torch.__version__.startswith("1.4"):
             logger.warning("Graph is only tested with PyTorch 1.4. Other versions might not work.")
-        from nni._graph_utils import build_graph
+        from nni.common.graph_utils import build_graph
         from google.protobuf import json_format
         # protobuf should be installed as long as tensorboard is installed
         try: