message: Set gpu_options.allow_growth = True
  Reduces memory used for 199-lightning from 2552MiB to 523MiB.
  This was added in Pull but got lost.
diff: @@ -141,7 +141,9 @@ class DualNetwork():
  self.hparams = get_default_hyperparams(**hparams)
  self.inference_input = None
  self.inference_output = None
  - self.sess = tf.Session(graph=tf.Graph())
  + config = tf.ConfigProto()
  + config.gpu_options.allow_growth = True
  + self.sess = tf.Session(graph=tf.Graph(), config=config)
  self.initialize_graph()
  def initialize_graph(self):
  