code: def forward(self, x):
      shifts = (
          (1, -1, 0, 0),
          (-1, 1, 0, 0),
          (0, 0, 1, -1),
          (0, 0, -1, 1),
      )
      shifted_x = list(map(lambda shift: F.pad(x, shift), shifts))
      x_with_shifts = torch.cat((x, *shifted_x), dim=1)
      return self.to_patch_tokens(x_with_shifts)
  
imports: from math import sqrt
  import torch
  import torch.nn.functional
  from torch import nn
  from einops import rearrange, repeat
  from einops.layers.torch import Rearrange
label_desc: Use image node_id 2 for calling the SPT obj's underlying member method code with example usage: obj.forward(x) and returns: self