How to use the hmmlearn.hmm.PoissonHMM.fit function in hmmlearn

init_params=init_params,
                      params=params,
                      random_state=random_state,
                      verbose=verbose)

        # initialize BinnedSpikeTrain attributes
        for attrib in self.__attributes__:
            exec("self." + attrib + " = None")

        self._extern_ = None
        self._ds = None
        # self._extern_map = None

        # create shortcuts to super() methods that are overridden in
        # this class
        self._fit = PHMM.fit
        self._score = PHMM.score
        self._score_samples = PHMM.score_samples
        self._predict = PHMM.predict
        self._predict_proba = PHMM.predict_proba
        self._decode = PHMM.decode

        self._sample = PHMM.sample