code: def forward(self, x):
      for b in self.blocks:
          x = b(x)
      return x
  
imports: import logging
  from enum import Enum
  import torch
  import torch.nn
  import torch.nn.functional
  from vissl.config import AttrDict
  from vissl.models.trunks import register_model_trunk
label_desc: Use image node_id 2 for calling the Blocks obj's underlying member method code with example usage: obj.forward(x) and returns: x