fix variable naming error

bleu_1234.py

@@ -104,10 +104,10 @@ class bleu_1234(evaluate.Metric):
             references = [[ref] for ref in references]
 
         bleu = BLEUScore()
-        bleu1 = bleu(preds, target, n_gram=1)
-        bleu2 = bleu(preds, target, n_gram=2)
-        bleu3 = bleu(preds, target, n_gram=3)
-        bleu4 = bleu(preds, target, n_gram=4)
+        bleu1 = bleu(predictions, references, n_gram=1)
+        bleu2 = bleu(predictions, references, n_gram=2)
+        bleu3 = bleu(predictions, references, n_gram=3)
+        bleu4 = bleu(predictions, references, n_gram=4)
 
         output_dict = {
             "bleu-1": bleu1,