gpu option. before queue

example_mnist.py

@@ -74,7 +74,7 @@ def get_model(inputs):
 
 def get_config():
     IMAGE_SIZE = 28
-    LOG_DIR = 'train_log'
+    LOG_DIR = os.path.join('train_log', os.path.basename(__file__)[:-3])
     BATCH_SIZE = 128
     logger.set_file(os.path.join(LOG_DIR, 'training.log'))
 
@@ -83,6 +83,7 @@ def get_config():
 
     sess_config = tf.ConfigProto()
     sess_config.device_count['GPU'] = 1
+    sess_config.gpu_options.allocator_type = 'BFC'
     sess_config.allow_soft_placement = True
 
     # prepare model

train.py

@@ -93,17 +93,16 @@ def start_train(config):
                     callbacks.trigger_step(feed, outputs, cost)
 
                 callbacks.trigger_epoch()
+    sess.close()
 
 def main(get_config_func):
     parser = argparse.ArgumentParser()
-    parser.add_argument('--gpu', help='GPU(s) to use.') # nargs='*' in multi mode
+    parser.add_argument('--gpu', help='comma separated list of GPU(s) to use.') # nargs='*' in multi mode
     args = parser.parse_args()
-    device = '/cpu:0'
     if args.gpu:
-        device = '/gpu:{}'.format(args.gpu)
+        os.environ['CUDA_VISIBLE_DEVICES'] = args.gpu
 
     with tf.Graph().as_default():
-        with tf.device(device):
         prepare()
         config = get_config_func()
         start_train(config)