code: def forward(self, img):
      x = self.to_patch_embedding(img)
      b, n, _ = x.shape
  
      x += self.pos_embedding[:, :n]
      x = self.dropout(x)
  
      x = self.transformer(x)
  
      return self.mlp_head(x)
  
imports: import torch
  from torch import nn
  from einops import rearrange, repeat
  from einops.layers.torch import Rearrange, Reduce
label_desc: Use image node_id 2 for calling the ViT obj's underlying member method code with example usage: obj.forward(img) and returns: self