code: def test_sklearn_transformer_checks():
      """Run the sklearn estimator validation checks on SymbolicTransformer"""
  
      check_estimator(
          SymbolicTransformer(
              population_size=50, hall_of_fame=10, generations=5
          )
      )
  
imports: from sklearn.utils.estimator_checks import check_estimator
  from gplearn.genetic import SymbolicClassifier, SymbolicRegressor
  from gplearn.genetic import SymbolicTransformer
label_desc: Use image node_id 3 for calling a global function with example usage: test_sklearn_transformer_checks() without return types