Encouraging TensorFlow to use more cores

I have been trying out some settings to see if I could speed up the training rate in the DQN-tensorflow Breakout demo. Configuring the session with the following code seemed to double the performance on my 5820K/GTX 1070 system (this is an extract from main.py in DQN-tensorflow):

 with tf.Session(config=tf.ConfigProto(
 )) as sess:

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