code: def test_explainer_valid_meta():
      exp = SimpleExplainer()
      assert hasattr(exp, "explain")
  
imports: import copy
  import numpy
  import pytest
  from alibi.api.interfaces import Explainer, Explanation, FitMixin
label_desc: Use image node_id 4 for calling a global function with example usage: test_explainer_valid_meta() without return types