Change default configuration for TensorFlow Session?

Question

Is it possible to change the default Session configuration, either within Python or by setting environment variables, etc.?

Specifically I'd like

with tf.Session() as sess:
    ...

to use up much less memory when I'm running small side tests in parallel to other jobs. So I'd the above to behave the same as

gpu_options = tf.GPUOptions(per_process_gpu_memory_fraction=0.1)
config = tf.ConfigProto(gpu_options=gpu_options)
with tf.Session(config=config) as sess:
    ...

Answer 1

Don't think there's a way to set process-wide default, but here's the pattern I use.

def create_session():
  config = tf.ConfigProto(log_device_placement=True)
  config.gpu_options.per_process_gpu_memory_fraction=0.3 # don't hog all vRAM
  sess = tf.InteractiveSession("", config=config)
  return sess

sess=create_session()
a=tf.constant(1)
b=tf.constant(2)
sess.run([a+b])