Make sure the device specification refers to a valid device

开始调用

with tf.Session() as sess,tf.device('/gpu:0'):

时报错：

InvalidArgumentError (see above for traceback): Cannot assign a device for operation 'init': Operation was explicitly assigned to /device:GPU:0 but available devices are [ /job:localhost/replica:0/task:0/cpu:0 ]. Make sure the device specification refers to a valid device.

解决方法：pip uninstall tensorflow

pip install tensorflow-gpu

下载cudnn v6，把include lib bin三个目录拷贝到下面目录：

C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v8.0\cuda

后来就能用了

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