close figures and set cache deletion

app.py

@@ -206,6 +206,8 @@ def run_demo(
     )
     undist_im = undist_im.cpu().permute(1, 2, 0).numpy()
 
+    plt.close(fig_ff)
+    plt.close(fig_pa)
     return (fig_ff, fig_pa, undist_im, summary)
 
 
@@ -225,6 +227,7 @@ def build_demo() -> gr.Blocks:
     with gr.Blocks(
         title="AnyCalib demo",
         fill_height=True,
+        delete_cache=(3600, 3600),
     ) as demo:
         gr.HTML(description)
         with gr.Row():