code: def inverse(self, z):
          
  
          p = np.power(z, 1. / self.power)
          return p
docs: Inverse of the power transform link function
  
          Parameters
          ----------
          `z` : array-like
              Value of the transformed mean parameters at `p`
  
          Returns
          -------
          `p` : array
              Mean parameters
  
          Notes
          -----
          g^(-1)(z`) = `z`**(1/`power`)