code: def build(self):
      raise NotImplementedError(
          "Must be overridden by concrete subclass"
      )
  
file_path: deepchem/contrib/torch/torch_model.py
imports: import torch
  import time
  import numpy
  from deepchem.trans import undo_transforms
  from deepchem.utils.save import log
  from deepchem.models import Model
label_desc: Use image node_id 7 for calling the TorchMultitaskModel obj's underlying member method code with example usage: obj.build() without return types