Prevent TensorFlow from accessing the GPU? [duplicate]

Have a look to this question or this answer.

To summarise you can add this piece of code:

import os
os.environ["CUDA_VISIBLE_DEVICES"] = "-1"
import tensorflow as tf

Playing with the CUDA_VISIBLE_DEVICES environment variable is one of if not the way to go whenever you have GPU-tensorflow installed and you don’t want to use any GPUs.

You to want either export CUDA_VISIBLE_DEVICES= or alternatively use a virtualenv with a non-GPU installation of TensorFlow.