code: def from_dict(cls, copula_dict):
          
          instance = cls(copula_dict['copula_type'])
          instance.theta = copula_dict['theta']
          instance.tau = copula_dict['tau']
          return instance
docs: Create a new instance from the given parameters.
  
          Args:
              copula_dict: `dict` with the parameters to replicate the copula.
              Like the output of `Bivariate.to_dict`
  
          Returns:
              Bivariate: Instance of the copula defined on the parameters.