Fix weakref unwrapping in AutoGraph conversion

PiperOrigin-RevId: 225850437

tensorflow/python/autograph/core/converter.py

@@ -218,6 +218,11 @@ class ConversionOptions(object):
     def as_qualified_name(o):
       name = inspect_utils.getqualifiedname(ctx.info.namespace, o, max_depth=1)
       if not name:
+        if isinstance(o, weakref.ref):
+          # `o` might already be a weak reference, if this object was
+          # constructed from code generated by `to_ast` itself.
+          # If so, unpack it.
+          o = o()
         # TODO(mdan): This needs to account for the symbols defined locally.
         name = ctx.namer.new_symbol(o.__name__, ())
         ctx.program.add_symbol(name, weakref.ref(o))