fix: resolve initialization error of FilterParams by default (#259)

Signed-off-by: ktro2828 <kotaro.uetake@tier4.jp>

Author: ktro2828

t4_devkit/filtering/parameter.py

@@ -28,8 +28,10 @@ class FilterParams:
 
     labels: Sequence[str | SemanticLabel] | None = field(
         default=None,
-        validator=validators.deep_iterable(
-            validators.or_(validators.instance_of(str), validators.instance_of(SemanticLabel))
+        validator=validators.optional(
+            validators.deep_iterable(
+                validators.or_(validators.instance_of(str), validators.instance_of(SemanticLabel))
+            )
         ),
     )
     uuids: Sequence[str] | None = field(

tests/fitering/test_filter_compose.py

@@ -4,6 +4,17 @@
 from t4_devkit.schema import VisibilityLevel
 
 
+def test_composite_filter_with_default_params(dummy_box3ds, dummy_box2ds, dummy_tf_buffer):
+    params = FilterParams()
+    box_filter = BoxFilter(params, dummy_tf_buffer)
+
+    answer3d = box_filter(dummy_box3ds)
+    answer2d = box_filter(dummy_box2ds)
+
+    assert len(answer3d) == len(dummy_box3ds)
+    assert len(answer2d) == len(dummy_box2ds)
+
+
 def test_composite_filter(dummy_box3ds, dummy_box2ds, dummy_tf_buffer) -> None:
     """Test `BoxFilter` compositing the box filters.