code: def on_trial_result(self, iteration, trials, trial, result, **info):
      self.counter += 1
  
file_path: ray/python/ray/tune/tests/execution/test_controller_callback_integration.py
imports: from typing import Dict, Optional
  import pytest
  import sys
  import ray
  from ray.air.execution import FixedResourceManager, PlacementGroupResourceManager
  from ray.tune import Callback
  from ray.tune.execution.tune_controller import TuneController
  from ray.tune.experiment import Trial
  from ray.train.tests.util import mock_storage_context
label_desc: Use image node_id 2 for calling the StatefulCallback obj's underlying member method code with example usage: obj.on_trial_result(iteration, trials, trial, result) without return types