Update app.py

app.py

@@ -11,7 +11,7 @@ module = evaluate.load("sunhill/cider")
 
 def compute_cider(references, predictions):
     predictions = [predictions]
-    references = [ref.strip() for ref in references.split(";") if ref.strip()]
+    references = [[ref.strip() for ref in references.split(";") if ref.strip()]]
     return module.compute(predictions=predictions, references=references)["cider_score"]