keep the download button out of cached examples, gradio crashes on it

app.py

@@ -58,8 +58,23 @@ def momask_generate(text, length, seed):
 def kimodo_example(prompt, model_label, frames, seed):
     """Examples vary the four columns worth varying; the advanced controls keep
     their defaults. Delegating to K.generate rather than duplicating it means a
-    cached example is the same code path the Generate button runs."""
-    yield from K.generate(prompt, model_label, int(frames), 20, int(seed), 2.0, True)
+    cached example is the same code path the Generate button runs.
+
+    The BVH button is dropped from the yielded tuple on purpose. Caching an
+    example whose outputs include a gr.DownloadButton crashes inside gradio:
+    postprocess_data reaches components/base.py `if self.info:` and
+    DownloadButton has no `info` attribute. Video, skeleton and log cache fine,
+    and the button still works normally from Generate.
+    """
+    for video, glb, _bvh, status in K.generate(
+            prompt, model_label, int(frames), 20, int(seed), 2.0, True):
+        yield video, glb, status
+
+
+def momask_example(text, length, seed):
+    """Same reason as above: cache the preview, leave the download button out."""
+    video, _bvh = momask_generate(text, length, seed)
+    return video
 
 
 def kimodo_tab():
@@ -111,7 +126,7 @@ def kimodo_tab():
             ["a person kicks with their right leg", K.CHECKPOINTS[2].label, 120, 101],
         ],
         inputs=[prompt, model_label, frames, seed],
-        outputs=[video, viewer, bvh, status],
+        outputs=[video, viewer, status],
         fn=kimodo_example,
         # Lazy is the only sane mode here. Each distinct prompt pays a ~110 s
         # LLM2Vec encode, so eager would add roughly ten minutes to every build
@@ -161,8 +176,8 @@ def momask_tab():
             ["A person does a salsa dance", 0, 789],
             ["A person kicks with their right leg", 0, 101],
         ],
-        inputs=[text, length, seed], outputs=[video, bvh],
-        fn=momask_generate,
+        inputs=[text, length, seed], outputs=[video],
+        fn=momask_example,
         # Lazy, not eager. Eager runs every row before the Space serves its first
         # request, and it would force torch, onnxruntime and CLIP resident at
         # startup for every visitor, which is exactly what _ensure_backends()