N.draw()

        Sets all N's stochastics to random values drawn from
        the normal approximation to the posterior.

def draw(self):
        """
        N.draw()

        Sets all N's stochastics to random values drawn from
        the normal approximation to the posterior.
        """
        devs = normal(size=self._sig.shape[1])
        p = inner(self._sig, devs) + self._mu
        self._set_stochastics(p)