class SVHNDataset(Dataset):
def __init__(self,
root_dir,
transform=transforms.Compose([transforms.ToTensor()])):
super().__init__()
self.root_dir = root_dir
self.transform = transform
self.dataset = SVHN(root_dir, transform=transform)
self.num_classes = 10
def __getitem__(self, index):
x, y = self.dataset.__getitem__(index)
y_onehot = [0.] * self.num_classes
y_onehot[y] = 1.
return {"x": x, "y_onehot": np.asarray(y_onehot, dtype=np.float32)}
def __len__(self):
return len(self.dataset)
class MNIST_SVHN_Dataset(Dataset):
def __init__(self, root_dir, transform=transforms.Compose([
transforms.ToTensor()])):
super().__init__()
self.root_dir = root_dir
# Transform is ignored
self.transform = transform
# MNIST
self.mnist_transform = transforms.Compose([
transforms.CenterCrop(28),
transforms.Resize(32),
transforms.ToTensor()])
self.mnist_dataset = MNIST(root_dir, transform=self.mnist_transform)
self.mnist_len = len(self.mnist_dataset)
# SVHN
self.svhn_transform = transforms.Compose([
transforms.CenterCrop(32),
transforms.Resize(32),
transforms.ToTensor()])
self.svhn_dataset = SVHN(os.path.join(root_dir, "SVHN"), transform=self.svhn_transform)
self.svhn_len = len(self.svhn_dataset)
def __getitem__(self, index):
y_onehot = [0.]*2
y_class_onehot = [0.]*10
if np.random.sample() < 0.3:
x, y = self.mnist_dataset.__getitem__(index % self.mnist_len)
x = torch.cat((x, x, x), dim=0)
y_onehot[0] = 1.
else:
x, y = self.svhn_dataset.__getitem__(index % self.svhn_len)
y_onehot[1] = 1.
y_class_onehot[y] = 1.
return {
"x": x,
"y_onehot": np.asarray(y_onehot, dtype=np.float32),
"y_class_onehot": np.asarray(y_class_onehot, dtype=np.float32)
}
def __len__(self):
return max([self.mnist_len, self.svhn_len])