lf.structured.class_dependencies to support cyclic dependencies.

PiperOrigin-RevId: 566806521

langfun/core/structured/schema.py

@@ -188,13 +188,14 @@ def _add_dependency(cls_or_classes):
     if isinstance(cls_or_classes, type):
       cls_or_classes = [cls_or_classes]
     for cls in cls_or_classes:
-      if cls not in seen:
+      if cls not in dependencies:
         dependencies.append(cls)
-        seen.add(cls)
 
   def _fill_dependencies(vs: pg.typing.ValueSpec, include_subclasses: bool):
     if isinstance(vs, pg.typing.Object):
       if issubclass(vs.cls, pg.Object) and vs.cls not in seen:
+        seen.add(vs.cls)
+
         # Add base classes as dependencies.
         for base_cls in vs.cls.__bases__:
           # We only keep track of user-defined symbolic classes.

langfun/core/structured/schema_test.py

@@ -32,6 +32,10 @@ class Itinerary(pg.Object):
   hotel: pg.typing.Str['.*Hotel'] | None
 
 
+class Node(pg.Object):
+  children: list['Node']
+
+
 class SchemaTest(unittest.TestCase):
 
   def assert_schema(self, annotation, spec):
@@ -201,6 +205,12 @@ class B(A):
     with self.assertRaisesRegex(TypeError, 'Unsupported spec type'):
       schema_lib.class_dependencies((Foo, 1))
 
+  def test_class_dependencies_recursive(self):
+    self.assertEqual(
+        schema_lib.class_dependencies(Node),
+        [Node]
+    )
+
   def test_class_dependencies_from_value(self):
     class Foo(pg.Object):
       x: int

requirements.txt

@@ -1,4 +1,4 @@
 jinja2>=3.1.2
 openai>=0.18.1
-pyglove>=0.4.3
+pyglove>=0.4.4.dev20230922
 termcolor==1.1.0