code: def test_etreg_shap_values(precalculated_et_regression_explainer):
      assert isinstance(
          precalculated_et_regression_explainer.get_shap_values_df(),
          pd.DataFrame,
      )
  
imports: import pandas
  import numpy
label_desc: Use image node_id 13 for calling a global function with example usage: test_etreg_shap_values(precalculated_et_regression_explainer) without return types