Update bert_tokenizer.py

bert_tokenizer.py

@@ -43,6 +43,7 @@ class ChineseBertTokenizer(BertTokenizerFast):
         self.max_length = 512
 
         download_file('vocab.txt')
+        print("vocab_file:", vocab_file)
         self.tokenizer = BertWordPieceTokenizer(vocab_file)
 
         # load pinyin map dict