初学tensorflow遇到的Error——UnrecognizedFlagError: Unknown command line flag 'f'

最近在学习《tensorflow实战》时需要下载cifar10数据集，在cifar10目录下用到命令：

import cifar10,cifar10_input
cifar10.maybe_download_and_extract()

出错，具体错误信息

UnrecognizedFlagError                     Traceback (most recent call last)

<ipython-input-2-e6d19815ade8> in <module>()

     15     return var

     16

---> 17 cifar10.maybe_download_and_extract()

     18 images_train,labels_train = cifar10_input.disorted_inputs(data_dir=data_dir,batch_size=batch_size)

     19 images_test,labels_test = cifar10_input.inputs(eval_data=True,data_dir=data_dir,batch_size=batch_size)

~/ml/models/tutorials/image/cifar10/cifar10.py in maybe_download_and_extract()

    379 def maybe_download_and_extract():

    380   """Download and extract the tarball from Alex's website."""

--> 381   dest_directory = FLAGS.data_dir

    382   if not os.path.exists(dest_directory):

    383     os.makedirs(dest_directory)

~/anaconda3/lib/python3.6/site-packages/tensorflow/python/platform/flags.py in __getattr__(self, name)

     82     # a flag.

     83     if not wrapped.is_parsed():

---> 84       wrapped(_sys.argv)

     85     return wrapped.__getattr__(name)

     86 

~/anaconda3/lib/python3.6/site-packages/absl/flags/_flagvalues.py in __call__(self, argv, known_only)

    628       suggestions = _helpers.get_flag_suggestions(name, list(self))

    629       raise _exceptions.UnrecognizedFlagError(

--> 630           name, value, suggestions=suggestions)

    631

    632     self.mark_as_parsed()

UnrecognizedFlagError: Unknown command line flag 'f'