diff --git a/ogb_examples/linkproppred/ogbl-ppa/monitor/train_monitor.py b/ogb_examples/linkproppred/ogbl-ppa/monitor/train_monitor.py
index fb118c914ef0a7b91ab5951be6951f84cf2dda33..a517b7c2679f51f4247912df8f661a20792720b8 100644
--- a/ogb_examples/linkproppred/ogbl-ppa/monitor/train_monitor.py
+++ b/ogb_examples/linkproppred/ogbl-ppa/monitor/train_monitor.py
@@ -132,7 +132,6 @@ def train_and_evaluate(exe,
 
             ret = metric.parse(ret)
             if global_step % train_log_step == 0:
-                sys.stderr.write(json.dumps(ret) + '\n')
                 for key, value in ret.items():
                     writer.add_scalar(
                         'train_' + key, value, global_step=global_step)
diff --git a/ogb_examples/linkproppred/ogbl-ppa/train.py b/ogb_examples/linkproppred/ogbl-ppa/train.py
index eecf8ae7c842fc428d7468385010a0b719e2f18d..c70fa4f9dd4987e615f6f935b5108c727fe7abee 100644
--- a/ogb_examples/linkproppred/ogbl-ppa/train.py
+++ b/ogb_examples/linkproppred/ogbl-ppa/train.py
@@ -30,15 +30,15 @@ ssl._create_default_https_context = ssl._create_unverified_context
 import numpy as np
 import multiprocessing
 
+import pgl
 import paddle
 import paddle.fluid as F
 import paddle.fluid.layers as L
-import pgl
 
+from args import parser
 from utils.args import print_arguments, check_cuda
 from utils.init import init_checkpoint, init_pretraining_params
-from args import parser
-from model import BaseGraph, GCNGraph
+from model import BaseGraph
 from dataloader.ogbl_ppa_dataloader import PPADataGenerator
 from monitor.train_monitor import train_and_evaluate, OgbEvaluator