From 19332b8b08f43c82b0fbd8bd0cb05c986145aa05 Mon Sep 17 00:00:00 2001
From: xuyige <xuyige1996@gmail.com>
Date: Fri, 26 Oct 2018 18:53:52 +0800
Subject: [PATCH] fix a bug

---
 fastNLP/core/dataset.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fastNLP/core/dataset.py b/fastNLP/core/dataset.py
index ad338649..6cfe6e87 100644
--- a/fastNLP/core/dataset.py
+++ b/fastNLP/core/dataset.py
@@ -30,7 +30,7 @@ class DataSet(list):
         return self
 
     def index_field(self, field_name, vocab):
-        if isinstance(field_name, str) and isinstance(vocab, Vocabulary):
+        if isinstance(field_name, str):
             field_list = [field_name]
             vocab_list = [vocab]
         else: