code: def _init_classifier(self):
      self.classifier = ClassifierLayer(
          self.config.classifier.type,
          in_dim=self.config.classifier.params.feature_dim,
          out_dim=self.vocab_size,
          **self.config.classifier.params,
      )
  
file_path: mmf/mmf/models/butd.py
imports: import torch
  from mmf.common.registry import registry
  from mmf.models.pythia import Pythia
  from mmf.modules.layers import ClassifierLayer
label_desc: Use image node_id 5 for calling the BUTD obj's underlying member method code with example usage: obj._init_classifier() without return types