code: def build_model(self):
      self.model = BiEncoderModule(self.params)
  
imports: import os
  import numpy
  import torch
  import torch.nn
  import torch.nn.functional
  from tqdm import tqdm
  from pytorch_transformers.modeling_bert import BertPreTrainedModel, BertConfig, BertModel
  from pytorch_transformers.tokenization_bert import BertTokenizer
  from blink.common.ranker_base import BertEncoder, get_model_obj
  from blink.common.optimizer import get_bert_optimizer
label_desc: Use image node_id 3 for calling the BiEncoderRanker obj's underlying member method code with example usage: obj.build_model() without return types