class_docstr: Task object for TF-Ranking.
class_docstr_tok: ["Task","object","for","TF-Ranking","."]
code: def build_model(self):
      return self._model_builder.build()
  
imports: import dataclasses
  from typing import Callable, Dict, Mapping, Optional, Tuple, Union
  import tensorflow
  from tensorflow_ranking.python import data
  from tensorflow_ranking.python.keras import losses
  from tensorflow_ranking.python.keras import metrics
  from tensorflow_ranking.python.keras import model
label_desc: Use image node_id 2 for calling the RankingTask obj's underlying member method code with example usage: obj.build_model() and returns: self