Resets the sampler to its initial state

        Note
        ----
        This will destroy the label cache and history of estimates

def reset(self):
        """Resets the sampler to its initial state

        Note
        ----
        This will destroy the label cache and history of estimates
        """
        super(DruckSampler, self).reset()
        self.strata.reset()
        self._TP_st = np.zeros([self.strata.n_strata_, self._n_class])
        self._PP_st = np.zeros([self.strata.n_strata_, self._n_class])
        self._P_st = np.zeros([self.strata.n_strata_, self._n_class])
        self._TP_rates = np.zeros([self.strata.n_strata_, self._n_class])
        self._PP_rates = np.zeros([self.strata.n_strata_, self._n_class])
        self._P_rates = np.zeros([self.strata.n_strata_, self._n_class])

        for k in self.strata.indices_:
            for i in range(2):
                self._iterate(fixed_stratum = k, calc_rates = False)