code: def test_dtclas_shap_base_value(
      precalculated_dt_classifier_explainer,
  ):
      assert isinstance(
          precalculated_dt_classifier_explainer.shap_base_value(),
          (np.floating, float),
      )
  
imports: import pandas
  import numpy
label_desc: Use image node_id 20 for calling a global function with example usage: test_dtclas_shap_base_value(precalculated_dt_classifier_explainer) without return types