class_docstr: Stirling numbers of the second kind
      
class_docstr_tok: ["Stirling","numbers","of","the","second","kind"]
docstr: clear cache of Sterling numbers
          
docstr_tok: ["clear","cache","of","Sterling","numbers"]
code: def clear_cache(self):
      """clear cache of Sterling numbers"""
      self._cache = {}
  
file_path: statsmodels/statsmodels/distributions/copula/_special.py
imports: import numpy
  from scipy.special import factorial
label_desc: Use image node_id 3 for calling the Sterling2 obj's underlying member method code with example usage: obj.clear_cache() without return types