RuntimeError: Input type (torch.FloatTensor) and weight type (torch.cuda.FloatTensor) should be the same
My code from the Pytorch’s tutorial. In particular, I followed the instruction to do that:
net = Net()
device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
net.to(device)
And also, did this:
inputs, labels = inputs.to(device), labels.to(device)
The tutorial mentioned how to add GPU support for the example, but didn’t put it into the complete code example. So I guess the way I added the GPU was incorrect, as above. Thanks for help.
import torch.nn as nn**strong text**
import torch.nn.functional as F
import torchvision.transforms as transforms
import torchvision
import torch
import matplotlib
matplotlib.use("TkAgg")
import matplotlib.pyplot as plt
import numpy
class Net(nn.Module):
    def __init__(self):
        super(Net, self).__init__()
        self.conv1 = nn.Conv2d(3, 6, 5)
        self.pool = nn.MaxPool2d(2, 2)
        self.conv2 = nn.Conv2d(6, 16, 5)
        self.fc1 = nn.Linear(16 * 5 * 5, 120)
        self.fc2 = nn.Linear(120, 84)
        self.fc3 = nn.Linear(84, 10)
    def forward(self, x):
        x = self.pool(F.relu(self.conv1(x)))
        x = self.pool(F.relu(self.conv2(x)))
        x = x.view(-1, 16 * 5 * 5)
        x = F.relu(self.fc1(x))
        x = F.relu(self.fc2(x))
        x = self.fc3(x)
        return x
net = Net()
device = torch.device("cuda:0" if torch.cuda.is_available() else "cpu")
net.to(device)
transform = transforms.Compose([transforms.ToTensor(), transforms.Normalize((0.5, 0.5, 0.5), (0.5, 0.5, 0.5))])
print(transform)
trainSet = torchvision.datasets.CIFAR10(root='./data', train=True, download=True, transform=transform)
trainLoader = torch.utils.data.DataLoader(trainSet, batch_size=4, shuffle=True, num_workers=2)
testSet = torchvision.datasets.CIFAR10(root='./data', train=False, download=True, transform=transform)
testLoader = torch.utils.data.DataLoader(testSet, batch_size=4, shuffle=False, num_workers=2)
classes = ('plane', 'car', 'bird', 'cat', 'deer', 'dog', 'frog', 'horse', 'ship', 'truck')
import torch.optim as optim
criterion = nn.CrossEntropyLoss()
optimizer = optim.SGD(net.parameters(), lr=0.001, momentum=0.9)
for epoch in range(2):
    running_loss = 0.0
    for i, data in enumerate(trainLoader, 0):
        inputs, labels = data
        inputs, labels = inputs.to(device), labels.to(device)
        optimizer.zero_grad()
        outputs = net(inputs)
        loss = criterion(outputs, labels)
        loss.backward()
        optimizer.step()
        running_loss += loss.item()
        if i % 2000 == 1999:
            print('[%d, %5d] loss %.3f' % (epoch + 1, i + 1, running_loss / 2000))
print('Finished traning!')
def imshow(img):
    img = img / 2 + 0.5
    npimg = img.numpy()
    plt.imshow(numpy.transpose(npimg, (1, 2, 0)))
    plt.show()
dataIter = iter(trainLoader)
images, labels = dataIter.next()
# imshow(torchvision.utils.make_grid(images))
print('GroundTruth: ', ' '.join('%5s' % classes[labels[j]] for j in range(4)))
outputs = net(images)
_, predicted = torch.max(outputs, 1)
print('Predicted: ', ' '.join('%5s' % classes[predicted[j]] for j in range(4)))
dataIter = iter(testLoader)
images, labels = dataIter.next()
# imshow(torchvision.utils.make_grid(images))
correct = 0
total = 0
with torch.no_grad():
    for data in testLoader:
        images, labels = data
        outputs = net(images)
        _, predicted = torch.max(outputs.data, 1)
        total += labels.size(0)
        correct += (predicted == labels).sum().item()
print("accuracy: %d %%", 100 * correct / total)