tensorflow on GPU: no known devices, despite cuda’s deviceQuery returning a “PASS” result

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From the log output, it looks like you are running the CPU version of TensorFlow (PyPI: tensorflow), and not the GPU version (PyPI: tensorflow-gpu). Running the GPU version would either log information about the CUDA libraries, or an error if it failed to load them or open the driver.

If you run the following commands, you should be able to use the GPU in subsequent runs:

$ pip uninstall tensorflow
$ pip install tensorflow-gpu

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