Created by: zishuaiz

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建立issue时，为快速解决问题，请您根据使用情况给出如下信息：

• 版本、环境信息：    1）PaddlePaddle版本：1.5.2    2）系统环境：MacBook Pro (Retina, 13-inch, Early 2015)
• 安装方式信息： 1）pip安装

Python 3.7.3 (default, Mar 27 2019, 16:54:48)
[Clang 4.0.1 (tags/RELEASE_401/final)] :: Anaconda, Inc. on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import paddle.fuild
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/site-packages/paddle/__init__.py", line 25, in <module>
    import paddle.dataset
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/site-packages/paddle/dataset/__init__.py", line 28, in <module>
    import paddle.dataset.mq2007
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/site-packages/paddle/dataset/mq2007.py", line 30, in <module>
    import rarfile
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/site-packages/rarfile.py", line 2950, in <module>
    _check_unrar_tool()
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/site-packages/rarfile.py", line 2931, in _check_unrar_tool
    custom_check([ORIG_UNRAR_TOOL], True)
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/site-packages/rarfile.py", line 2823, in custom_check
    p = custom_popen(cmd)
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/site-packages/rarfile.py", line 2813, in custom_popen
    creationflags=creationflags)
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/subprocess.py", line 775, in __init__
    restore_signals, start_new_session)
  File "/Users/xx/anaconda3/envs/py3env/lib/python3.7/subprocess.py", line 1522, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
NotADirectoryError: [Errno 20] Not a directory: 'unrar'