[maintenance] add lazy caching

app.py

@@ -257,7 +257,7 @@ with gr.Blocks(css=css) as demo:
                     inputs=[input_image, prompt], 
                     outputs=[result, seed], 
                     fn=infer, 
-                    cache_examples=False)
+                    cache_examples="lazy")
 
     gr.on(
         triggers=[run_button.click, prompt.submit],