removed the eval callback

examples/shields/rl/13_minigridsb.py

@@ -88,7 +88,7 @@ def main():
 
         imageAndVideoCallback = ImageRecorderCallback(eval_env, render_freq, n_eval_episodes=1, evaluation_method=evaluate_policy, log_dir=log_dir, deterministic=True, verbose=0)
 
-    model.learn(steps,callback=[imageAndVideoCallback, InfoCallback(), evalCallback])
+    model.learn(steps,callback=[imageAndVideoCallback, InfoCallback()])
     model.save(f"{log_dir}/{expname(args)}")