code: def load(cls, copula_path):
          
          with open(copula_path) as f:
              copula_dict = json.load(f)
  
          return cls.from_dict(copula_dict)
docs: Create a new instance from a file.
  
          Args:
              copula_path: `str` file with the serialized copula.
  
          Returns:
              Bivariate: Instance with the parameters stored in the file.