进入Notebook项目后，只显示Markdown，不显示Code。

试过Firefox、Edge都出现过这个问题，关闭项目后重新打开还是一样。重新导入ipynb也是不行。

请问这个要如何解决，谢谢！

截图这里红色箭头本来是应该有Code的，现在只显示Markdown部分：

打开ipynb文件内这部分的代码：

{
   "cell_type": "markdown",
   "metadata": {
    "collapsed": false
   },
   "source": [
    "# Paddle\n",
    "Python 3.7 安装 Paddle 1.8.5 (https://www.paddlepaddle.org.cn/install/old?docurl=/documentation/docs/zh/install/pip/windows-pip.html#anchor-4) PaddleHub 1.8.1\n",
    "```\n",
    "python3 -m pip install paddlepaddle==1.8.5 -i https://mirror.baidu.com/pypi/simple\n",
    "pip install paddlehub==1.8.1\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {
    "collapsed": false
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Running Verify Fluid Program ... \n",
      "Your Paddle Fluid works well on SINGLE GPU or CPU.\n",
      "Your Paddle Fluid works well on MUTIPLE GPU or CPU.\n",
      "Your Paddle Fluid is installed successfully! Let's start deep Learning with Paddle Fluid now\n"
     ]
    }
   ],
   "source": [
    "#Ready for paddle\n",
    "import paddle.fluid as fluid\n",
    "fluid.install_check.run_check()\n",
    "#import paddlehub as hub"
   ]
  }