text: """Helper to module to fix mypy checking."""
  
  
  class BaseEstimator:
      pass
  
  
  class TransformerMixin:
      pass
  
  
  class RegressorMixin:
      pass
  
  
  class ClassifierMixin:
      pass
  
  
  class PGM:
      def __init__(self, *args, **kwargs):
          pass
  