code: def pre_func(self, i, fields="qkv"):
      layer = self.layers[i]
  
      def func(nodes):
          x = nodes.data["x"]
          norm_x = layer.sublayer[0].norm(x)
          return layer.self_attn.get(norm_x, fields=fields)
  
      return func
  
imports: from .config import *
  from .act import *
  from .attention import *
  from .viz import *
  from .layers import *
  from .functions import *
  from .embedding import *
  import threading
  import dgl.function
  import torch
  import torch.nn.init
label_desc: Use image node_id 2 for calling the Encoder obj's underlying member method code with example usage: obj.pre_func(i, fields) and returns: func, layer