How to use the contextualbandits.utils._LinUCBnTSSingle function in contextualbandits

"""
        Adds a new arm to the pool of choices

        Parameters
        ----------
        arm_name : object
            Name for this arm. Only applicable when using named arms. If None, will use the name of the last
            arm plus 1 (will only work when the names are integers).

        Returns
        -------
        self : object
            This object
        """
        arm_name = _BasePolicy._check_new_arm_name(self, arm_name)
        self._oracles.append(_LinUCBnTSSingle(self.alpha, self._ts))
        _BasePolicy._append_arm(self, arm_name)
        return self

def _add_common_lin(self, alpha, nchoices, njobs):
        if isinstance(alpha, int):
            alpha = float(alpha)
        assert isinstance(alpha, float)

        _BasePolicy._add_choices(self, nchoices)
        _check_constructor_input(_ZeroPredictor(), nchoices)
        self.njobs = _check_njobs(njobs)
        self.alpha = alpha
        self.nchoices = nchoices
        self._oracles = [_LinUCBnTSSingle(self.alpha, self._ts) for n in range(nchoices)]
        if not self._ts:
            self.v_sq = self.alpha
            del self.alpha
        self.is_fitted = False