def _dist_kw_arg(self, k):
        """
        Returns a dictionary of keyword arguments
        for the k'th distribution.

        :param int k: Index of the distribution in question.
        :rtype: ``dict``
        """
        if self._dist_kw_args is not None:
            return {
                key:self._dist_kw_args[key][k,:]
                for key in self._dist_kw_args.keys()
            }
        else:
            return {}