[Misc] Align dgl multi-gpu example to graphbolt (#6605)

examples/multigpu/node_classification_sage.py

@@ -123,12 +123,13 @@ class SAGE(nn.Module):
         return y
 
 
-def evaluate(model, g, num_classes, dataloader):
+def evaluate(device, model, g, num_classes, dataloader):
     model.eval()
     ys = []
     y_hats = []
     for it, (input_nodes, output_nodes, blocks) in enumerate(dataloader):
         with torch.no_grad():
+            blocks = [block.to(device) for block in blocks]
             x = blocks[0].srcdata["feat"]
             ys.append(blocks[-1].dstdata["label"])
             y_hats.append(model(blocks, x))
@@ -145,6 +146,8 @@ def layerwise_infer(
 ):
     model.eval()
     with torch.no_grad():
+        if not use_uva:
+            g = g.to(device)
         pred = model.module.inference(g, device, batch_size, use_uva)
         pred = pred[nid]
         labels = g.ndata["label"][nid].to(pred.device)
@@ -159,17 +162,20 @@ def train(
     proc_id,
     nprocs,
     device,
+    args,
     g,
     num_classes,
     train_idx,
     val_idx,
     model,
     use_uva,
-    num_epochs,
 ):
     # Instantiate a neighbor sampler
     sampler = NeighborSampler(
-        [10, 10, 10], prefetch_node_feats=["feat"], prefetch_labels=["label"]
+        [10, 10, 10],
+        prefetch_node_feats=["feat"],
+        prefetch_labels=["label"],
+        fused=(args.mode != "benchmark"),
     )
     train_dataloader = DataLoader(
         g,
@@ -179,7 +185,7 @@ def train(
         batch_size=1024,
         shuffle=True,
         drop_last=False,
-        num_workers=0,
+        num_workers=args.num_workers,
         use_ddp=True,  # To split the set for each process
         use_uva=use_uva,
     )
@@ -191,12 +197,12 @@ def train(
         batch_size=1024,
         shuffle=True,
         drop_last=False,
-        num_workers=0,
+        num_workers=args.num_workers,
         use_ddp=True,
         use_uva=use_uva,
     )
     opt = torch.optim.Adam(model.parameters(), lr=0.001, weight_decay=5e-4)
-    for epoch in range(num_epochs):
+    for epoch in range(args.num_epochs):
         t0 = time.time()
         model.train()
         total_loss = 0
@@ -224,7 +230,8 @@ def train(
         # for more information.
         #####################################################################
         acc = (
-            evaluate(model, g, num_classes, val_dataloader).to(device) / nprocs
+            evaluate(device, model, g, num_classes, val_dataloader).to(device)
+            / nprocs
         )
         t1 = time.time()
         # Reduce `acc` tensors to process 0.
@@ -236,7 +243,7 @@ def train(
             )
 
 
-def run(proc_id, nprocs, devices, g, data, mode, num_epochs):
+def run(proc_id, nprocs, devices, g, data, args):
     # Find corresponding device for current process.
     device = devices[proc_id]
     torch.cuda.set_device(device)
@@ -263,9 +270,10 @@ def run(proc_id, nprocs, devices, g, data, mode, num_epochs):
         rank=proc_id,
     )
     num_classes, train_idx, val_idx, test_idx = data
-    train_idx = train_idx.to(device)
-    val_idx = val_idx.to(device)
-    g = g.to(device if mode == "puregpu" else "cpu")
+    if args.mode != "benchmark":
+        train_idx = train_idx.to(device)
+        val_idx = val_idx.to(device)
+        g = g.to(device if args.mode == "puregpu" else "cpu")
     in_size = g.ndata["feat"].shape[1]
     model = SAGE(in_size, 256, num_classes).to(device)
     model = DistributedDataParallel(
@@ -273,20 +281,21 @@ def run(proc_id, nprocs, devices, g, data, mode, num_epochs):
     )
 
     # Training.
-    use_uva = mode == "mixed"
+    use_uva = args.mode == "mixed"
+
     if proc_id == 0:
         print("Training...")
     train(
         proc_id,
         nprocs,
         device,
+        args,
         g,
         num_classes,
         train_idx,
         val_idx,
         model,
         use_uva,
-        num_epochs,
     )
 
     # Testing.
@@ -303,7 +312,7 @@ if __name__ == "__main__":
     parser.add_argument(
         "--mode",
         default="mixed",
-        choices=["mixed", "puregpu"],
+        choices=["mixed", "puregpu", "benchmark"],
         help="Training mode. 'mixed' for CPU-GPU mixed training, "
         "'puregpu' for pure-GPU training.",
     )
@@ -317,7 +326,7 @@ if __name__ == "__main__":
     parser.add_argument(
         "--num_epochs",
         type=int,
-        default=20,
+        default=10,
         help="Number of epochs for train.",
     )
     parser.add_argument(
@@ -332,6 +341,12 @@ if __name__ == "__main__":
         default="dataset",
         help="Root directory of dataset.",
     )
+    parser.add_argument(
+        "--num_workers",
+        type=int,
+        default=0,
+        help="Number of workers",
+    )
     args = parser.parse_args()
     devices = list(map(int, args.gpu.split(",")))
     nprocs = len(devices)
@@ -364,6 +379,6 @@ if __name__ == "__main__":
     # To use DDP with n GPUs, spawn up n processes.
     mp.spawn(
         run,
-        args=(nprocs, devices, g, data, args.mode, args.num_epochs),
+        args=(nprocs, devices, g, data, args),
         nprocs=nprocs,
     )