94 lines
2.8 KiB
Python
94 lines
2.8 KiB
Python
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import torch
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import torch.nn as nn
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import torch.nn.functional as F # Add this line
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import torchvision
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import torchvision.transforms as transforms
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# Device configuration
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device = torch.device("cuda" if torch.cuda.is_available() else "cpu")
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# Hyper-parameters
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num_epochs = 5
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batch_size = 4
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learning_rate = 0.001
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# Dataset has PILImage images of range [0, 1].
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# We transform them to Tensors of normalized range [-1, 1]
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transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))])
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# CIFAR10: 60000 32x32 color images in 10 classes, with 6000 images per class
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train_dataset = torchvision.datasets.CIFAR10(root="./data", train=True, download=True, transform=transform)
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test_dataset = torchvision.datasets.CIFAR10(root="./data", train=False, download=True, transform=transform)
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train_loader = torch.utils.data.DataLoader(train_dataset, batch_size=batch_size, shuffle=True)
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test_loader = torch.utils.data.DataLoader(test_dataset, batch_size=batch_size, shuffle=False)
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class ConvNet(nn.Module):
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def __init__(self):
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super(ConvNet, self).__init__()
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self.conv1 = nn.Conv2d(3, 6, 5)
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self.pool = nn.MaxPool2d(2, 2)
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self.conv2 = nn.Conv2d(6, 16, 5)
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self.fc1 = nn.Linear(16 * 5 * 5, 120)
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self.fc2 = nn.Linear(120, 84)
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self.fc3 = nn.Linear(84, 10)
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def forward(self, x):
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x = self.pool(F.relu(self.conv1(x)))
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x = self.pool(F.relu(self.conv2(x)))
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x = x.view(-1, 16 * 5 * 5)
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# x = F.relu(self.fc1(x))
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x = self.fc1(x)
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# x = F.relu(self.fc2(x))
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x = self.fc2(x)
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x = self.fc3(x)
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return x
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model = ConvNet().to(device)
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criterion = nn.CrossEntropyLoss()
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optimizer = torch.optim.SGD(model.parameters(), lr=learning_rate)
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# Train the model
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n_total_steps = len(train_loader)
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for epoch in range(num_epochs):
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for i, (images, labels) in enumerate(train_loader):
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images = images.to(device)
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labels = labels.to(device)
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# Forward pass
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outputs = model(images)
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loss = criterion(outputs, labels)
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# Backward and optimize
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optimizer.zero_grad()
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loss.backward()
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optimizer.step()
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if (i + 1) % 2000 == 0:
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print(f"Epoch [{epoch+1}/{num_epochs}], Step [{i+1}/{n_total_steps}], Loss: {loss.item():.4f}")
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print("Finished Training")
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# Test the model
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with torch.no_grad():
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n_correct = 0
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n_samples = 0
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for images, labels in test_loader:
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images = images.to(device)
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labels = labels.to(device)
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outputs = model(images)
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# max returns (value ,index)
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_, predicted = torch.max(outputs.data, 1)
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n_samples += labels.size(0)
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n_correct += (predicted == labels).sum().item()
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acc = 100.0 * n_correct / n_samples
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print(f"Accuracy of the network on the 10000 test images: {acc} %")
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