code: def test_etreg_shap_base_value(precalculated_et_regression_explainer):
      assert isinstance(
          precalculated_et_regression_explainer.shap_base_value(),
          (np.floating, float),
      )
  
imports: import pandas
  import numpy
label_desc: Use image node_id 11 for calling a global function with example usage: test_etreg_shap_base_value(precalculated_et_regression_explainer) without return types