import torch
from monai.data import MetaTensor

a = torch.rand(1,2,3)
print(a.shape, type(a.shape)) # prints torch.Size([1, 2, 3]) <class 'torch.Size'>

a_meta = MetaTensor(a)
print(a_meta.shape, type(a_meta.shape)) # prints (1, 2, 3) <class 'tuple'>

print('numel of last two dims', a.shape[1:].numel()) # prints 6
print('numel of last two dims', a_meta.shape[1:].numel()) # crashes

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'tuple' object has no attribute 'numel'