Example caching now works with components without a label attribute (e.g. Column) (#3123)

* add non io component support for example caching

* chaneglog

CHANGELOG.md

@@ -15,6 +15,7 @@ By [@freddyaboulton](https://github.com/freddyaboulton) in [PR 3089](https://git
 
 ## Bug Fixes:
 - Fixes URL resolution on Windows by [@abidlabs](https://github.com/abidlabs) in [PR 3108](https://github.com/gradio-app/gradio/pull/3108) 
+- Example caching now works with components without a label attribute (e.g. `Column`) by [@abidlabs](https://github.com/abidlabs) in [PR 3123](https://github.com/gradio-app/gradio/pull/3123) 
 - Ensure the Video component correctly resets the UI state whe a new video source is loaded and reduce choppiness of UI by [@pngwn](https://github.com/abidlabs) in [PR 3117](https://github.com/gradio-app/gradio/pull/3117)
 
 ## Documentation Changes:

gradio/flagging.py

@@ -201,7 +201,7 @@ class CSVLogger(FlaggingCallback):
         log_filepath = Path(flagging_dir) / "log.csv"
         is_new = not Path(log_filepath).exists()
         headers = [
-            component.label or f"component {idx}"
+            getattr(component, "label", None) or f"component {idx}"
             for idx, component in enumerate(self.components)
         ] + [
             "flag",
@@ -212,7 +212,7 @@ class CSVLogger(FlaggingCallback):
         csv_data = []
         for idx, (component, sample) in enumerate(zip(self.components, flag_data)):
             save_dir = Path(flagging_dir) / utils.strip_invalid_filename_characters(
-                component.label or f"component {idx}"
+                getattr(component, "label", None) or f"component {idx}"
             )
             if utils.is_update(sample):
                 csv_data.append(str(sample))

test/test_examples.py

@@ -295,6 +295,27 @@ class TestProcessExamples:
         prediction = await io.examples_handler.load_from_cache(0)
         assert prediction == ["hel", "3"]
 
+    @pytest.mark.asyncio
+    async def test_caching_with_non_io_component(self):
+        def predict(name):
+            return name, gr.update(visible=True)
+
+        with gr.Blocks():
+            t1 = gr.Textbox()
+            with gr.Column(visible=False) as c:
+                t2 = gr.Textbox()
+
+            examples = gr.Examples(
+                [["John"], ["Mary"]],
+                fn=predict,
+                inputs=[t1],
+                outputs=[t2, c],
+                cache_examples=True,
+            )
+
+        prediction = await examples.load_from_cache(0)
+        assert prediction == ["John", {"visible": True, "__type__": "update"}]
+
     def test_end_to_end(self):
         def concatenate(str1, str2):
             return str1 + str2