code: def __init__(self):
      self.validation_metrics = []
  
file_path: determined/harness/tests/experiment/fixtures/pytorch_identity/model_def.py
imports: from typing import Any, Dict, Tuple
  import torch.utils.data
  from determined import pytorch
label_desc: Use image node_id 1 to create a new MetricsCallback object from inherited base classes: pytorch with example: obj = MetricsCallback()