Merge pull request #154 from shippingwang/hide_visualdl

hide visualdl

tools/train.py

@@ -19,7 +19,6 @@ from __future__ import print_function
 import argparse
 import os
 
-from visualdl import LogWriter
 import paddle.fluid as fluid
 from paddle.fluid.incubate.fleet.base import role_maker
 from paddle.fluid.incubate.fleet.collective import fleet
@@ -101,7 +100,12 @@ def main(args):
         compiled_valid_prog = program.compile(config, valid_prog)
 
     compiled_train_prog = fleet.main_program
-    vdl_writer = LogWriter(args.vdl_dir) if args.vdl_dir else None
+
+    if args.vdl_dir:
+        from visualdl import LogWriter
+        vdl_writer = LogWriter(args.vdl_dir)
+    else:
+        vdl_writer = None
 
     for epoch_id in range(config.epochs):
         # 1. train with train dataset