code: def get_widths_mean_var(self, estimation):
          
          widths_mean_var = \
              estimation[self.map_offset[3]:].reshape(self.K, 1)
          return widths_mean_var
docs: Get estimation on the variance of widths' mean
  
  
          Parameters
          ----------
          estimation : 1D arrary
               Either prior of posterior estimation
  
  
          Returns
          -------
  
          widths_mean_var : 2D array, in shape [K, 1]
              Estimation on variance of widths' mean