Decorates the structure with oxidation state, guessing
        using Composition.oxi_state_guesses()

        Args:
            **kwargs: parameters to pass into oxi_state_guesses()

def add_oxidation_state_by_guess(self, **kwargs):
        """
        Decorates the structure with oxidation state, guessing
        using Composition.oxi_state_guesses()

        Args:
            **kwargs: parameters to pass into oxi_state_guesses()
        """
        oxid_guess = self.composition.oxi_state_guesses(**kwargs)
        oxid_guess = oxid_guess or \
                     [dict([(e.symbol, 0) for e in self.composition])]
        self.add_oxidation_state_by_element(oxid_guess[0])