code: def likelihood(self):
          
          if self._likelihood is None:
              self._likelihood = exp(self.log_likelihood)
              if self._likelihood == 0:
                  self._likelihood = sys.float_info.min
          return self._likelihood
docs: Computed from the log-likelihood. The log-likelihood can be very
          small,  meaning a large negative value such as -28000. Taking the
          exp() of that results in 0.0, which can break typical algorithms
          which multiply by this value, so by default we always return a
          number >= sys.float_info.min.