From 35f3889338e0ac9a90e2a0ace40978b106bd5d32 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Luk=C3=A1=C5=A1=20Pokr=C3=BDvka?=
 <lukas.pokryvka@student.tuke.sk>
Date: Thu, 12 Nov 2020 15:19:10 +0000
Subject: [PATCH] =?UTF-8?q?P=C5=99idat=20=E2=80=9Epages/students/2016/luka?=
 =?UTF-8?q?s=5Fpokryvka/dp2021/mnist/mnist-dist.py=E2=80=9C?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../lukas_pokryvka/dp2021/mnist/mnist-dist.py | 105 ++++++++++++++++++
 1 file changed, 105 insertions(+)
 create mode 100644 pages/students/2016/lukas_pokryvka/dp2021/mnist/mnist-dist.py

diff --git a/pages/students/2016/lukas_pokryvka/dp2021/mnist/mnist-dist.py b/pages/students/2016/lukas_pokryvka/dp2021/mnist/mnist-dist.py
new file mode 100644
index 000000000..789bf6c8d
--- /dev/null
+++ b/pages/students/2016/lukas_pokryvka/dp2021/mnist/mnist-dist.py
@@ -0,0 +1,105 @@
+import os
+from datetime import datetime
+import argparse
+import torch.multiprocessing as mp
+import torchvision
+import torchvision.transforms as transforms
+import torch
+import torch.nn as nn
+import torch.distributed as dist
+from apex.parallel import DistributedDataParallel as DDP
+from apex import amp
+
+
+def main():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('-n', '--nodes', default=1, type=int, metavar='N',
+                        help='number of data loading workers (default: 4)')
+    parser.add_argument('-g', '--gpus', default=1, type=int,
+                        help='number of gpus per node')
+    parser.add_argument('-nr', '--nr', default=0, type=int,
+                        help='ranking within the nodes')
+    parser.add_argument('--epochs', default=2, type=int, metavar='N',
+                        help='number of total epochs to run')
+    args = parser.parse_args()
+    args.world_size = args.gpus * args.nodes
+    os.environ['MASTER_ADDR'] = '147.232.47.114'
+    os.environ['MASTER_PORT'] = '8888'
+    mp.spawn(train, nprocs=args.gpus, args=(args,))
+
+
+class ConvNet(nn.Module):
+    def __init__(self, num_classes=10):
+        super(ConvNet, self).__init__()
+        self.layer1 = nn.Sequential(
+            nn.Conv2d(1, 16, kernel_size=5, stride=1, padding=2),
+            nn.BatchNorm2d(16),
+            nn.ReLU(),
+            nn.MaxPool2d(kernel_size=2, stride=2))
+        self.layer2 = nn.Sequential(
+            nn.Conv2d(16, 32, kernel_size=5, stride=1, padding=2),
+            nn.BatchNorm2d(32),
+            nn.ReLU(),
+            nn.MaxPool2d(kernel_size=2, stride=2))
+        self.fc = nn.Linear(7*7*32, num_classes)
+
+    def forward(self, x):
+        out = self.layer1(x)
+        out = self.layer2(out)
+        out = out.reshape(out.size(0), -1)
+        out = self.fc(out)
+        return out
+
+
+def train(gpu, args):
+    rank = args.nr * args.gpus + gpu
+    dist.init_process_group(backend='nccl', init_method='env://', world_size=args.world_size, rank=rank)
+    torch.manual_seed(0)
+    model = ConvNet()
+    torch.cuda.set_device(gpu)
+    model.cuda(gpu)
+    batch_size = 10
+    # define loss function (criterion) and optimizer
+    criterion = nn.CrossEntropyLoss().cuda(gpu)
+    optimizer = torch.optim.SGD(model.parameters(), 1e-4)
+    # Wrap the model
+    model = nn.parallel.DistributedDataParallel(model, device_ids=[gpu])
+    # Data loading code
+    train_dataset = torchvision.datasets.MNIST(root='./data',
+                                               train=True,
+                                               transform=transforms.ToTensor(),
+                                               download=True)
+    train_sampler = torch.utils.data.distributed.DistributedSampler(train_dataset,
+                                                                    num_replicas=args.world_size,
+                                                                    rank=rank)
+    train_loader = torch.utils.data.DataLoader(dataset=train_dataset,
+                                               batch_size=batch_size,
+                                               shuffle=False,
+                                               num_workers=0,
+                                               pin_memory=True,
+                                               sampler=train_sampler)
+
+    start = datetime.now()
+    total_step = len(train_loader)
+    for epoch in range(args.epochs):
+        for i, (images, labels) in enumerate(train_loader):
+            images = images.cuda(non_blocking=True)
+            labels = labels.cuda(non_blocking=True)
+            # Forward pass
+            outputs = model(images)
+            loss = criterion(outputs, labels)
+
+            # Backward and optimize
+            optimizer.zero_grad()
+            loss.backward()
+            optimizer.step()
+            if (i + 1) % 100 == 0 and gpu == 0:
+                print('Epoch [{}/{}], Step [{}/{}], Loss: {:.4f}'.format(epoch + 1, args.epochs, i + 1, total_step,
+                                                                         loss.item()))
+    if gpu == 0:
+        print("Training complete in: " + str(datetime.now() - start))
+
+
+if __name__ == '__main__':
+    torch.multiprocessing.set_start_method('spawn')
+    main()
\ No newline at end of file