From 623bf24f0c840fe9b9ee808d0b2d84de79918677 Mon Sep 17 00:00:00 2001
From: n+e <463003665@qq.com>
Date: Mon, 14 Sep 2020 15:59:32 +0800
Subject: [PATCH] fix unittest (#218)

---
 tianshou/data/buffer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tianshou/data/buffer.py b/tianshou/data/buffer.py
index 1e817d9..8cf4f6b 100644
--- a/tianshou/data/buffer.py
+++ b/tianshou/data/buffer.py
@@ -143,7 +143,7 @@ class ReplayBuffer:
         self._last_obs = save_only_last_obs
         self._index = 0
         self._size = 0
-        self._meta = Batch()
+        self._meta: Batch = Batch()
         self.reset()
 
     def __len__(self) -> int: