class_docstr: This component can be used for ANY PyTorch Lightning script to track its progress and extract its best model
  path.
code: def __init__(self, *args, **kwargs):
      super().__init__(*args, **kwargs)
      # Define the component state.
      self.global_step = None
      self.best_model_path = None
  
file_path: pytorch-lightning/examples/app/components/python/component_tracer.py
imports: from lightning.app.components import TracerPythonScript
  from lightning.app.storage.path import Path
  from lightning.app.utilities.tracer import Tracer
  from lightning.pytorch import Trainer
label_desc: Use image node_id 1 to create a new PLTracerPythonScript object from inherited base classes: TracerPythonScript with example: obj = PLTracerPythonScript()