From 547764efc9d77bc5c54b8ec872562bbbe79e545f Mon Sep 17 00:00:00 2001
From: Peter Zhokhov <peterz@openai.com>
Date: Thu, 24 Jan 2019 14:33:50 -0800
Subject: [PATCH] flake8 fix

---
 baselines/common/vec_env/subproc_vec_env.py | 1 -
 1 file changed, 1 deletion(-)

diff --git a/baselines/common/vec_env/subproc_vec_env.py b/baselines/common/vec_env/subproc_vec_env.py
index 134e371..e040e3d 100644
--- a/baselines/common/vec_env/subproc_vec_env.py
+++ b/baselines/common/vec_env/subproc_vec_env.py
@@ -111,7 +111,6 @@ def _flatten_obs(obs):
     assert len(obs) > 0
 
     if isinstance(obs[0], dict):
-        import collections
         keys = obs[0].keys()
         return {k: np.stack([o[k] for o in obs]) for k in keys}
     else: