我正在实现使用张量流多处理的IMPALA框架https://github.com/deepmind/scalable_agent。当实验运行指定数量的步骤时，一切似乎都正常运行...但是当tensorflow关闭进程时，我开始出现类型错误。

有人知道造成此错误的原因是什么以及如何解决它？这似乎是带有tensorflow的东西，而不是原始代码本身。

    INFO:tensorflow:Closing all processes.
    [750.    450.     25.125]
    2020-01-13 17:01:00.624889: W tensorflow/core/framework/op_kernel.cc:1389] Invalid argument: TypeError: an integer is required (got type NoneType)
    Traceback (most recent call last):

      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/ops/script_ops.py",line 207,in __call__
        ret = func(*args)

      File "/home/haianh/anaconda3/envs/lab/scalable_agent/py_process.py",line 86,in py_call
        result = self._out.recv()

      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/multiprocessing/connection.py",line 250,in recv
        buf = self._recv_bytes()

      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/multiprocessing/connection.py",line 411,in _recv_bytes
        return self._recv(size)

      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/multiprocessing/connection.py",line 379,in _recv
        chunk = read(handle,remaining)

    TypeError: an integer is required (got type NoneType)


    INFO:tensorflow:Error reported to Coordinator: <class 'tensorflow.python.framework.errors_impl.InvalidArgumentError'>,TypeError: an integer is required (got type NoneType)
    Traceback (most recent call last):

      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/ops/script_ops.py",remaining)

    TypeError: an integer is required (got type NoneType)


         [[{{node scan/while/flow_environment_step/step}}]]
    INFO:tensorflow:All processes closed.
    Traceback (most recent call last):
      File "experiment.py",line 689,in <module>
        tf.app.run()
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/platform/app.py",line 125,in run
        _sys.exit(main(argv))
      File "experiment.py",line 683,in main
        train(action_set,level_names)
      File "experiment.py",line 630,in train
        session.run(enqueue_ops)
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/training/monitored_session.py",line 788,in __exit__
        self._close_internal(exception_type)
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/training/monitored_session.py",line 826,in _close_internal
        self._sess.close()
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/training/monitored_session.py",line 1082,in close
        self._sess.close()
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/training/monitored_session.py",line 1244,in close
        ignore_live_threads=True)
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/training/coordinator.py",line 389,in join
        six.reraise(*self._exc_info_to_raise)
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/six.py",line 696,in reraise
        raise value
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/training/queue_runner_impl.py",line 257,in _run
        enqueue_callable()
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/client/session.py",line 1257,in _single_operation_run
        self._call_tf_sessionrun(None,{},[],target_list,None)
      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/client/session.py",line 1407,in _call_tf_sessionrun
        run_metadata)
    tensorflow.python.framework.errors_impl.InvalidArgumentError: TypeError: an integer is required (got type NoneType)
    Traceback (most recent call last):

      File "/home/haianh/anaconda3/envs/lab/lib/python3.6/site-packages/tensorflow/python/ops/script_ops.py",remaining)

    TypeError: an integer is required (got type NoneType)


         [[{{node scan/while/flow_environment_step/step}}]]