给定组=1，大小为 [10, 1, 5, 5] 的权重，预期输入 [2, 3, 28, 28] 有 1 个通道，但有 3 个通道

原文标题 ：Given groups=1, weight of size [10, 1, 5, 5], expected input[2, 3, 28, 28] to have 1 channels, but got 3 channels instead

我正在尝试使用 train MNIST 运行 CNN，但要使用我自己的书面数字进行测试。为此，我编写了以下代码，但在此问题的标题中出现错误：我正在尝试使用 train MNIST 运行 CNN，但在我自己的书面数字上进行测试。为此，我编写了以下代码，但在此问题的标题中出现错误：

batch_size = 64
train_dataset = datasets.MNIST(root='./data/',
                               train=True,
                               transform=transforms.ToTensor(),
                               download=True)
test_dataset = ImageFolder('my_digit_images/', transform=transforms.ToTensor())
train_loader = torch.utils.data.DataLoader(dataset=train_dataset,
                                           batch_size=batch_size,
                                           shuffle=True)
test_loader = torch.utils.data.DataLoader(dataset=test_dataset,
                                          batch_size=batch_size,
                                          shuffle=False)
class Net(nn.Module):

    def __init__(self):
        super(Net, self).__init__()
        self.conv1 = nn.Conv2d(1, 10, kernel_size=5)
        #print(self.conv1.weight.shape)
        self.conv2 = nn.Conv2d(10, 20, kernel_size=5)
        self.conv3 = nn.Conv2d(20, 20, kernel_size=3)
       #print(self.conv2.weight.shape)
        self.mp = nn.MaxPool2d(2)
        self.fc = nn.Linear(320, 10)

    def forward(self, x):
        in_size = x.size(0)
        x = F.relu(self.conv1(x))
        #print(x.shape)
        x = F.relu(self.mp(self.conv2(x)))
        x = F.relu(self.mp(self.conv3(x)))
        
        #print("2.", x.shape)
       # x = F.relu(self.mp(self.conv3(x)))
        x = x.view(in_size, -1)  # flatten the tensor
        #print("3.", x.shape)
        x = self.fc(x)
        return F.log_softmax(x)
model = Net()
optimizer = optim.SGD(model.parameters(), lr=0.01, momentum=0.5)
def train(epoch):
    model.train()
    for batch_idx, (data, target) in enumerate(train_loader):
        data, target = Variable(data), Variable(target)
        optimizer.zero_grad()
        output = model(data)
        loss = F.nll_loss(output, target)
        loss.backward()
        optimizer.step()
        if batch_idx % 10 == 0:
            print('Train Epoch: {} [{}/{} ({:.0f}%)]\tLoss: {:.6f}'.format(
                epoch, batch_idx * len(data), len(train_loader.dataset),
                100. * batch_idx / len(train_loader), loss.item()))


def test():
    model.eval()
    test_loss = 0
    correct = 0
    for data, target in test_loader:
        data, target = Variable(data, volatile=True), Variable(target)
        output = model(data)
        test_loss += F.nll_loss(output, target, size_average=False).data
        pred = output.data.max(1, keepdim=True)[1]
        correct += pred.eq(target.data.view_as(pred)).cpu().sum()

    test_loss /= len(test_loader.dataset)
    print('\nTest set: Average loss: {:.4f}, Accuracy: {}/{} ({:.0f}%)\n'.format(
        test_loss, correct, len(test_loader.dataset),
        100. * correct / len(test_loader.dataset)))