我們load了一個data iter后，怎么知道里面的內(nèi)容呢？
一個方法：

next(iter(data_iter))

另一個方法：

for data in dataloader:
    # process your data
    print(data)

需要知道它們的shape怎么辦呢：

for data in train_iter:
    print(data)  # To understand the structure
    # If data is a tuple like (features, labels), you can print their shapes individually
    features, labels = data
    print(features.shape, labels.shape)
    break