narrow down gym version to 0.15.4 <= gym < 0.16.0

baselines/bench/monitor.py

@@ -9,6 +9,7 @@ import json
 
 class Monitor(Wrapper):
     EXT = "monitor.csv"
+    f = None
 
     def __init__(self, env, filename, allow_early_resets=False, reset_keywords=(), info_keywords=()):
         Wrapper.__init__(self, env=env)
@@ -76,9 +77,8 @@ class Monitor(Wrapper):
         self.total_steps += 1
 
     def close(self):
-        super(Monitor, self).close()
-        if self.results_writer is not None:
-            self.results_writer.f.close()
+        if self.f is not None:
+            self.f.close()
 
     def get_total_steps(self):
         return self.total_steps