问题描述：

MoelArts开发环境的Jupyter Notebook在创建网络时，报运行时错误

<ipython-input-11-4c04f2570cce> in <module>

26         return x
    27
---> 28 network = LeNet5()
    29 print("layer conv1:", network.conv1)
    30 print("*"*40)

<ipython-input-11-4c04f2570cce> in __init__(self, num_class, num_channel)
     6     # define the operator required
     7     def __init__(self, num_class=10, num_channel=1):
----> 8         super(LeNet5, self).__init__()
     9         self.conv1 = nn.Conv2d(num_channel, 6, 5, pad_mode='valid')
    10         self.conv2 = nn.Conv2d(6, 16, 5, pad_mode='valid')

~/miniconda3/envs/Mindspore-0.5.0/lib/python3.7/site-packages/mindspore/nn/cell.py in __init__(self, auto_prefix, flags)
    69         self._parameter_layout_dict = {}
    70         self._create_time = int(time.time() * 1e9)
---> 71         init_backend()
    72         # call gc to release GE session resources used by non-used cell objects
    73         gc.collect()

RuntimeError: mindspore/ccsrc/utils/context/ms_context.cc:216 OpenTsd] Device 0 is occupied, open tsd failed, status = 18100359.

此错误是偶发性的，运行前不可预测。

建议方案：

1、为在线运行的脚本本提供检测空闲设备的接口

2、或者系统可以在所有设备被占用的情况下自动排队，并输出当前排队状态。