Add @spaces.GPU() decorator to retrieval function

app.py

@@ -336,6 +336,7 @@ with gr.Blocks(theme=my_theme, css=custom_css, head=font_awesome_html) as demo:
             pdf_file = f"examples/retrieval/{pdf_file}"
         return pdf_file, claim
 
+    @spaces.GPU()
     def retrieve_evidence_with_method(pdf_file, claim, top_k, method):
         """
         Retrieve evidence using the selected method