docstr: Test selection of params not involving flattening
docstr_tok: ["Test","selection","of","params","not","involving","flattening"]
code: def test_no_flatten(self, space, hspace):
      """Test selection of params not involving flattening"""
      assert flatten_params(space, ["x", "y"]) == ["x", "y"]
      assert flatten_params(hspace, ["z"]) == ["z"]
  
imports: import numpy
  import pandas
  import pytest
  from sklearn.ensemble import AdaBoostRegressor, BaggingRegressor, ExtraTreesRegressor, GradientBoostingRegressor, RandomForestRegressor
  from orion.analysis.base import average, flatten_numpy, flatten_params, ranking, to_numpy, train_regressor
  from orion.core.io.space_builder import SpaceBuilder
  from orion.core.worker.transformer import build_required_space
label_desc: Use image node_id 5 for calling the TestFlattenParams obj's underlying member method code with example usage: obj.test_no_flatten(space, hspace) without return types