diff --git a/src/py3.x/tensorflow2.x/config.py b/src/py3.x/tensorflow2.x/config.py
index 22df209d..ed410bd3 100644
--- a/src/py3.x/tensorflow2.x/config.py
+++ b/src/py3.x/tensorflow2.x/config.py
@@ -12,3 +12,4 @@ class Config(object):
     max_len = 6
     batch_size = 512
     learning_rate = 0.001
+    pre_num = 2
\ No newline at end of file