import argparse
import tensorflow as tf

args = argparse.ArgumentParser()
args.add_argument("--dev_sample_percentage", type=float, default=.1)
args.add_argument("--batch_size", type=int, default=64)

config, unparsed = args.parse_known_args()

...

with tf.Graph().as_default():
  session_conf = tf.ConfigProto(
    allow_soft_placement=config.allow_soft_placement,
    log_device_placement=config.log_device_placement)