[Fix] fix some typos in example/ogb/deepwalk/ (#2190)

* line

* two lines

* update readme

* readme

* update readme

* update
Co-authored-by: Zihao Ye <expye@outlook.com>
Co-authored-by: xiang song(charlie.song) <classicxsong@gmail.com>

examples/pytorch/ogb/deepwalk/README.md

@@ -101,12 +101,12 @@ python3 mlp.py --device 2 --runs 10
 
 ogbl-citation
 ```
-python3 deepwalk.py --ogbl_name ogbl-citation --load_from_ogbl --save_in_pt --output_emb_file embedding.pt --window_size 2 --num_walks 10 --negative 1 --neg_weight 1 --walk_length 80 --batch_size 128 --print_loss --print_interval 1000 --mix --gpus 0 --use_context_weight --num_threads 4 --lap_norm 0.05 --lr 0.1
+python3 deepwalk.py --ogbl_name ogbl-citation --load_from_ogbl --save_in_pt --output_emb_file embedding.pt --window_size 2 --num_walks 10 --negative 1 --neg_weight 1 --walk_length 80 --batch_size 128 --print_loss --print_interval 1000 --mix --gpus 0 --use_context_weight --num_threads 4 --lap_norm 0.01 --lr 0.1
 cp embedding_pt_file_path ./
 python3 mlp.py --device 2 --runs 10 --use_node_embedding
 ```
 
-### OGBL Resuls
+### OGBL Results
 ogbl-collab
 <br>#params: 61258346(model) + 131841(mlp) = 61390187
 <br>Hits@10
@@ -143,7 +143,6 @@ ogbl-collab
 <br>&emsp;&emsp;Final Train: 50.99 ± 1.72
 <br>&emsp;&emsp;Final Test: 33.56 ± 3.95
 
-
 <br>ogbl-ppa
 <br>#params: 150024820(model) + 113921(mlp) = 150138741
 <br>Hits@10
@@ -165,8 +164,22 @@ ogbl-collab
 <br>ogbl-citation
 <br>#params: 757811178(model) + 131841(mlp) = 757943019
 <br>MRR
-<br>&emsp;Highest Train: 0.8994 ± 0.0004
-<br>&emsp;Highest Valid: 0.8271 ± 0.0003
-<br>&emsp;&emsp;Final Train: 0.8991 ± 0.0007
-<br>&emsp;&emsp;Final Test: 0.8284 ± 0.0005
+<br>&emsp;Highest Train: 0.9381 ± 0.0003
+<br>&emsp;Highest Valid: 0.8469 ± 0.0003
+<br>&emsp;&emsp;Final Train: 0.9377 ± 0.0004
+<br>&emsp;&emsp;Final Test: 0.8479 ± 0.0003
+
+### Notes
+#### Multi-GPU issues
+For efficiency, the results of ogbl-collab, ogbl-ppa, ogbl-ddi are run with multi-GPU. Since ogb is somehow incompatible with our multi-GPU implementation, we need to do some preprocessing. The command is:
+```
+python3 load_dataset.py --name dataset_name
+```
+It will output a data file to the local. For example, if `dataset_name` is `ogbl-collab`, then a file `ogbl-collab-net.txt` will be generated. Then we run 
+```
+python3 deepwalk.py --data_file data_file_path
+```
+where the other parameters are the same with used configs without using `--load_from_ogbl` and `--ogbl_name`.
 
+#### Others
+The performance on ogbl-ddi and ogbl-ppa can be not that stable.
\ No newline at end of file

examples/pytorch/ogb/deepwalk/load_dataset.py

@@ -2,6 +2,7 @@
 
 import argparse
 from ogb.linkproppred import DglLinkPropPredDataset
+import time
 
 def load_from_ogbl_with_name(name):    
     choices = ['ogbl-collab', 'ogbl-ddi', 'ogbl-ppa', 'ogbl-citation']
@@ -17,6 +18,7 @@ if __name__ == "__main__":
         help="name of datasets by ogb")
     args = parser.parse_args()
 
+    print("loading graph... it might take some time")
     name = args.name
     g = load_from_ogbl_with_name(name=name)
 
@@ -26,13 +28,23 @@ if __name__ == "__main__":
     except:
         weighted = False
 
+    
+    edge_num = g.edges()[0].shape[0]
+    src = list(g.edges()[0])
+    tgt = list(g.edges()[1])
+    if weighted:
+        weight = list(g.edata['edge_weight'])
+
+    print("writing...")
+    start_time = time.time()
     with open(name + "-net.txt", "w") as f:
-        for i in range(g.edges()[0].shape[0]):
+        for i in range(edge_num):
             if weighted:
-                f.write(str(g.edges()[0][i].item()) + " "\
-                    +str(g.edges()[1][i].item()) + " "\
-                    +str(g.edata['edge_weight'][i].item()) + "\n")
+                f.write(str(src[i].item()) + " "\
+                    +str(tgt[i].item()) + " "\
+                    +str(weight[i].item()) + "\n")
             else:
-                f.write(str(g.edges()[0][i].item()) + " "\
-                    +str(g.edges()[1][i].item()) + " "\
-                    +"1\n")
\ No newline at end of file
+                f.write(str(src[i].item()) + " "\
+                    +str(tgt[i].item()) + " "\
+                    +"1\n")
+    print("writing used time: %d s" % int(time.time() - start_time))
\ No newline at end of file

examples/pytorch/ogb/deepwalk/reading_data.py

@@ -111,7 +111,7 @@ def net2graph(net_sm):
     return G
 
 def make_undirected(G):
-    G.readonly(False)
+    #G.readonly(False)
     G.add_edges(G.edges()[1], G.edges()[0])
     return G