make expand_args_fields optional

Summary: Call expand_args_field when instantiating an object.

Reviewed By: shapovalov

Differential Revision: D39541931

fbshipit-source-id: de8e1038927ff0112463394412d5d8c26c4a1e17

docs/tutorials/implicitron_volumes.ipynb

@@ -147,7 +147,7 @@
         "from pytorch3d.implicitron.models.generic_model import GenericModel\n",
         "from pytorch3d.implicitron.models.implicit_function.base import ImplicitFunctionBase\n",
         "from pytorch3d.implicitron.models.renderer.base import EvaluationMode\n",
-        "from pytorch3d.implicitron.tools.config import expand_args_fields, get_default_args, registry, remove_unused_components\n",
+        "from pytorch3d.implicitron.tools.config import get_default_args, registry, remove_unused_components\n",
         "from pytorch3d.renderer import RayBundle\n",
         "from pytorch3d.renderer.implicit.renderer import VolumeSampler\n",
         "from pytorch3d.structures import Volumes\n",
@@ -245,17 +245,6 @@
         "!wget -P data/cow_mesh https://dl.fbaipublicfiles.com/pytorch3d/data/cow_mesh/cow_texture.png"
       ]
     },
-    {
-      "cell_type": "markdown",
-      "metadata": {
-        "customInput": null,
-        "originalKey": "2a976be8-01bf-4a1c-a6e7-61d5d08c3dbd",
-        "showInput": false
-      },
-      "source": [
-        "If we want to instantiate one of Implicitron's configurable objects, such as `RenderedMeshDatasetMapProvider`, without using the OmegaConf initialisation (get_default_args), we need to call `expand_args_fields` on the class first."
-      ]
-    },
     {
       "cell_type": "code",
       "execution_count": null,
@@ -272,7 +261,6 @@
       },
       "outputs": [],
       "source": [
-        "expand_args_fields(RenderedMeshDatasetMapProvider)\n",
         "cow_provider = RenderedMeshDatasetMapProvider(\n",
         "    data_file=\"data/cow_mesh/cow.obj\",\n",
         "    use_point_light=False,\n",
@@ -468,7 +456,6 @@
         "    gm = GenericModel(**cfg)\n",
         "else:\n",
         "    # constructing GenericModel directly\n",
-        "    expand_args_fields(GenericModel)\n",
         "    gm = GenericModel(\n",
         "        implicit_function_class_type=\"MyVolumes\",\n",
         "        render_image_height=output_resolution,\n",

pytorch3d/implicitron/tools/config.py

@@ -167,12 +167,6 @@ thing as the default for a member of another configured class,
 """
 
 
-_unprocessed_warning: str = (
-    " must be processed before it can be used."
-    + " This is done by calling expand_args_fields "
-    + "or get_default_args on it."
-)
-
 TYPE_SUFFIX: str = "_class_type"
 ARGS_SUFFIX: str = "_args"
 ENABLED_SUFFIX: str = "_enabled"
@@ -183,39 +177,42 @@ TWEAK_SUFFIX: str = "_tweak_args"
 
 class ReplaceableBase:
     """
-    Base class for dataclass-style classes which
-    can be stored in the registry.
+    Base class for a class (a "replaceable") which is a base class for
+    dataclass-style implementations. The implementations can be stored
+    in the registry. They get expanded into dataclasses with expand_args_fields.
+    This expansion is delayed.
     """
 
     def __new__(cls, *args, **kwargs):
         """
-        This function only exists to raise a
-        warning if class construction is attempted
-        without processing.
+        These classes should be expanded only when needed (because processing
+        fixes the list of replaceable subclasses of members of the class). It
+        is safer if users expand the classes explicitly. But if the class gets
+        instantiated when it hasn't been processed, we expand it here.
         """
         obj = super().__new__(cls)
         if cls is not ReplaceableBase and not _is_actually_dataclass(cls):
-            warnings.warn(cls.__name__ + _unprocessed_warning)
+            expand_args_fields(cls)
         return obj
 
 
 class Configurable:
     """
-    This indicates a class which is not ReplaceableBase
-    but still needs to be
+    Base class for dataclass-style classes which are not replaceable. These get
     expanded into a dataclass with expand_args_fields.
     This expansion is delayed.
     """
 
     def __new__(cls, *args, **kwargs):
         """
-        This function only exists to raise a
-        warning if class construction is attempted
-        without processing.
+        These classes should be expanded only when needed (because processing
+        fixes the list of replaceable subclasses of members of the class). It
+        is safer if users expand the classes explicitly. But if the class gets
+        instantiated when it hasn't been processed, we expand it here.
         """
         obj = super().__new__(cls)
         if cls is not Configurable and not _is_actually_dataclass(cls):
-            warnings.warn(cls.__name__ + _unprocessed_warning)
+            expand_args_fields(cls)
         return obj
 
 

tests/implicitron/test_config.py

@@ -315,6 +315,9 @@ class TestConfig(unittest.TestCase):
         ]
         self.assertEqual(sorted(large_args.keys()), needed_args)
 
+        with self.assertRaisesRegex(ValueError, "NotAFruit has not been registered."):
+            LargeFruitBowl(extra_fruit_class_type="NotAFruit")
+
     def test_inheritance2(self):
         # This is a case where a class could contain an instance
         # of a subclass, which is ignored.
@@ -564,16 +567,19 @@ class TestConfig(unittest.TestCase):
 
     def test_unprocessed(self):
         # behavior of Configurable classes which need processing in __new__,
-        class Unprocessed(Configurable):
+        class UnprocessedConfigurable(Configurable):
             a: int = 9
 
         class UnprocessedReplaceable(ReplaceableBase):
-            a: int = 1
+            a: int = 9
+
+        for Unprocessed in [UnprocessedConfigurable, UnprocessedReplaceable]:
 
-        with self.assertWarnsRegex(UserWarning, "must be processed"):
-            Unprocessed()
-        with self.assertWarnsRegex(UserWarning, "must be processed"):
-            UnprocessedReplaceable()
+            self.assertFalse(_is_actually_dataclass(Unprocessed))
+            unprocessed = Unprocessed()
+            self.assertTrue(_is_actually_dataclass(Unprocessed))
+            self.assertTrue(isinstance(unprocessed, Unprocessed))
+            self.assertEqual(unprocessed.a, 9)
 
     def test_enum(self):
         # Test that enum values are kept, i.e. that OmegaConf's runtime checks