add gpu_options to support high tf

tensor2tensor/utils/trainer_utils.py

@@ -315,6 +315,7 @@ def session_config():
 
 
   gpu_options = tf.GPUOptions(
   gpu_options = tf.GPUOptions(
       per_process_gpu_memory_fraction=FLAGS.worker_gpu_memory_fraction)
       per_process_gpu_memory_fraction=FLAGS.worker_gpu_memory_fraction)
+  gpu_options.allow_growth = True
 
 
   config = tf.ConfigProto(allow_soft_placement=True,
   config = tf.ConfigProto(allow_soft_placement=True,
                           graph_options=graph_options,
                           graph_options=graph_options,