code: def build_validation_data_loader(self) -> pytorch.DataLoader:
      validation_data = data.get_dataset(self.data_dir, train=False)
      return pytorch.DataLoader(
          validation_data, batch_size=self.per_slot_batch_size
      )
  
file_path: determined/harness/tests/experiment/fixtures/pytorch_amp/train.py
imports: import logging
  import pathlib
  from typing import Any, Dict
  import data
  import model
  import torch
  from ruamel import yaml
  from torch import nn
  import determined
  from determined import pytorch
label_desc: Use image node_id 3 for calling the MNistTrial obj's underlying member method code with example usage: obj.build_validation_data_loader() and returns: pytorch