Update Space (evaluate main: 7bd80a1d)

chrf.py

@@ -170,10 +170,11 @@ class ChrF(evaluate.Metric):
         # if only one reference is provided make sure we still use list of lists
         if isinstance(references[0], str):
             references = [[ref] for ref in references]
-
         references_per_prediction = len(references[0])
         if any(len(refs) != references_per_prediction for refs in references):
-            raise ValueError("Sacrebleu requires the same number of references for each prediction")
+            raise ValueError(
+                "ChrF, as implemented by sacrebleu, requires the same number of references for each prediction"
+            )
         transformed_references = [[refs[i] for refs in references] for i in range(references_per_prediction)]
 
         sb_chrf = CHRF(char_order, word_order, beta, lowercase, whitespace, eps_smoothing)