code: def build(self):
      super().build()
      self.tie_weights()
  
      if self.config.get("freeze_base", False):
          for n, p in self.named_parameters():
              if "classifier" not in n:
                  p.requires_grad = False
  
imports: import torch
  from mmf.common.registry import registry
  from mmf.models.pythia import Pythia
  from mmf.modules.embeddings import ProjectionEmbedding
  from mmf.utils.transform import transform_to_batch_sequence
  from torch import nn
label_desc: Use image node_id 3 for calling the MMFBert obj's underlying member method code with example usage: obj.build() without return types