code: def dummy_lambda_cb_func():
      def _on_fold_start(_rep, _fold, _run):
          print(_rep, _fold, _run)
  
      return lambda_callback(on_fold_start=_on_fold_start)
  
file_path: hyperparameter_hunter/tests/integration_tests/test_lambda_callback.py
imports: from hyperparameter_hunter import Environment, CVExperiment, lambda_callback
  from hyperparameter_hunter.callbacks.bases import BaseCallback
  from hyperparameter_hunter.callbacks.recipes import confusion_matrix_oof
  from hyperparameter_hunter.utils.learning_utils import get_diabetes_data
  from copy import deepcopy
  import pytest
  from sklearn.ensemble import AdaBoostRegressor
label_desc: Use image node_id 3 for calling a global function with example usage: dummy_lambda_cb_func() and returns: lambda_callback