code: def forward(self, img):
      device = img.device
  
      x = self.to_patch_embedding(img)
      x += self.pos_embedding.to(device, dtype=x.dtype)
  
      x = self.transformer(x)
      x = x.mean(dim=1)
  
      x = self.to_latent(x)
      return self.linear_head(x)
  
imports: import torch
  from torch import nn
  import torch.nn.functional
  from einops import rearrange
  from einops.layers.torch import Rearrange
label_desc: Use image node_id 2 for calling the SimpleViT obj's underlying member method code with example usage: obj.forward(img) and returns: self