---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-8-71d6509178f5> in <module>()
----> 1 tfe.num_gpus()

~/anaconda3/lib/python3.6/site-packages/tensorflow/python/eager/context.py in num_gpus()
    458     The number of available GPU devices.
    459   """
--> 460   return context().num_gpus()

~/anaconda3/lib/python3.6/site-packages/tensorflow/python/eager/context.py in num_gpus(self)
    286   def num_gpus(self):
    287     """The number of GPUs available to execute operations."""
--> 288     self._initialize_handle_and_devices()
    289     return self._num_gpus
    290 

~/anaconda3/lib/python3.6/site-packages/tensorflow/python/eager/context.py in _initialize_handle_and_devices(self)
    121         with errors.raise_exception_on_not_ok_status() as status:
    122           if self._config is not None:
--> 123             config_str = self._config.SerializeToString()
    124             pywrap_tensorflow.TFE_ContextOptionsSetConfig(
    125                 opts, config_str, len(config_str), status)

AttributeError: 'int' object has no attribute 'SerializeToString'