print('type(batch_x): ',type(batch_x))
type(batch_x):  <class ‘torch.Tensor’>
print('batch_x.dtype: ',batch_x.dtype)
batch_x.dtype:  torch.float32
print('type(batch_y): ',type(batch_y))
type(batch_y):  <class ‘tuple’>
why？batch_x is different from batch_y.