code: def _get_help_for_estimator(prefix, estimator, defaults=None):
      
      from numpydoc.docscrape import ClassDoc
  
      defaults = defaults or {}
      estimator = _extract_estimator_cls(estimator)
      yield "<{}> options:".format(estimator.__name__)
  
      doc = ClassDoc(estimator)
      yield from _get_help_for_params(
          doc['Parameters'],
          prefix=prefix,
          defaults=defaults,
      )
      yield ''
docs: Yield help lines for the given estimator and prefix.