How does gpu_nr work?

[dpmcgonigle]

Hello!

I was looking at the gpu_nr option, and:

1. There is no documentation on gpu_nr in TensorFlow's documentation that I could find.
2. There is also only a single result in your codebase for gpu_nr with grep, where it is defined.
3. Google has a single search result for 'tensorflow "gpu_nr"', which is your repository.

If gpu_nr works, how does it work? Can you specify specific GPUs, or do you just put the total number of GPUs and then Tensorflow allocates those GPUs to the program?

Thank you for your help!