Merge branch 'develop' of https://github.com/Yelrose/PGL into develop

ogb_examples/linkproppred/ogbl-ppa/README.md

@@ -6,11 +6,16 @@
 ### Requirements
 
 paddlpaddle >= 1.7.1
+
 pgl 1.0.2
+
 ogb
 
+
 ### How to Run
 
 ```
 CUDA_VISIBLE_DEVICES=0,1,2,3 python train.py --use_cuda 1  --num_workers 4 --output_path ./output/model_1 --batch_size 65536 --epoch 1000 --learning_rate 0.005  --hidden_size 256 
 ```
+
+The best record will be saved in ./output/model_1/best.txt.