code: def eval_fn(test_data):
      return {"some_score": 1.2}
  
file_path: fklearn/tests/validation/test_validator.py
imports: import warnings
  from datetime import datetime, timedelta
  import pandas
  from toolz.functoolz import identity
  from fklearn.training.classification import lgbm_classification_learner
  from fklearn.validation import splitters, evaluators
  from fklearn.validation.validator import validator_iteration, validator, parallel_validator
  from fklearn.validation.perturbators import perturbator, nullify
  import pytest
label_desc: Use image node_id 2 for calling a global function with example usage: eval_fn(test_data) and returns: dict