support multi-base for config re-route

Summary: as title

Reviewed By: Cysu

Differential Revision: D31901433

fbshipit-source-id: 1749527c04c392c830e1a49bca8313ddf903d7b1

d2go/config/config.py

@@ -56,16 +56,22 @@ def reroute_load_yaml_with_base():
     _safe_load = yaml.safe_load
     _unsafe_load = yaml.unsafe_load
 
-    def mock_safe_load(f):
-        cfg = _safe_load(f)
+    def _reroute_base(cfg):
         if BASE_KEY in cfg:
+            if isinstance(cfg[BASE_KEY], list):
+                cfg[BASE_KEY] = [reroute_config_path(x) for x in cfg[BASE_KEY]]
+            else:
                 cfg[BASE_KEY] = reroute_config_path(cfg[BASE_KEY])
         return cfg
 
+    def mock_safe_load(f):
+        cfg = _safe_load(f)
+        cfg = _reroute_base(cfg)
+        return cfg
+
     def mock_unsafe_load(f):
         cfg = _unsafe_load(f)
-        if BASE_KEY in cfg:
-            cfg[BASE_KEY] = reroute_config_path(cfg[BASE_KEY])
+        cfg = _reroute_base(cfg)
         return cfg
 
     with mock.patch("yaml.safe_load", side_effect=mock_safe_load):

d2go/config/utils.py

@@ -19,6 +19,7 @@ def reroute_config_path(path: str) -> str:
     Those config are considered as code, so they'll reflect your current checkout,
         try using canary if you have local changes.
     """
+    assert isinstance(path, str), path
 
     if path.startswith("d2go://"):
         rel_path = path[len("d2go://") :]

tests/misc/test_config.py

@@ -51,6 +51,22 @@ class TestConfig(unittest.TestCase):
             another_cfg = default_cfg.clone()
             another_cfg.merge_from_file(file_name)
 
+    def test_base_reroute(self):
+        default_cfg = GeneralizedRCNNRunner().get_default_cfg()
+
+        # use rerouted file as base
+        cfg = default_cfg.clone()
+        cfg.merge_from_file(get_resource_path("rerouted_base.yaml"))
+        self.assertEqual(cfg.MODEL.MASK_ON, True)  # base is loaded
+        self.assertEqual(cfg.MODEL.FBNET_V2.ARCH, "test")  # non-base is loaded
+
+        # use multiple files as base
+        cfg = default_cfg.clone()
+        cfg.merge_from_file(get_resource_path("rerouted_multi_base.yaml"))
+        self.assertEqual(cfg.MODEL.MASK_ON, True)  # base is loaded
+        self.assertEqual(cfg.MODEL.FBNET_V2.ARCH, "FBNetV3_A")  # second base is loaded
+        self.assertEqual(cfg.OUTPUT_DIR, "test")  # non-base is loaded
+
     def test_default_cfg_dump_and_load(self):
         default_cfg = GeneralizedRCNNRunner().get_default_cfg()
 

tests/resources/rerouted_base.yaml

+_BASE_: "detectron2go://mask_rcnn_fbnetv3a_C4.yaml"
+MODEL:
+  FBNET_V2:
+    ARCH: "test"

tests/resources/rerouted_multi_base.yaml

+_BASE_:
+  - "rerouted_base.yaml"
+  - "detectron2go://mask_rcnn_fbnetv3a_C4.yaml"
+OUTPUT_DIR: "test"