code: def vflip(img: Tensor) -> Tensor:
      _assert_image_tensor(img)
  
      return img.flip(-2)
  
imports: import warnings
  from typing import List, Optional, Tuple, Union
  import torch
  from torch import Tensor
  from torch.nn.functional import conv2d, grid_sample, interpolate, pad
label_desc: Use image node_id 9 for calling a global function with example usage: vflip(img) and returns: img