code: def build(self):
      self._init_text_embedding()
      self._init_image_encoders()
      self._init_image_embeddings()
      self._init_combine_layer()
      self._init_decoder()
      self._init_extras()
  
file_path: mmf/mmf/models/visdial_multi_modal.py
imports: from mmf.models.pythia import Pythia
  from mmf.modules.decoders import VisDialDiscriminator
label_desc: Use image node_id 2 for calling the VisDialMultiModalModel obj's underlying member method code with example usage: obj.build() without return types