Takes an acquisition and weights it so the domain and cost are taken into account.

def acquisition_function(self,x):
        """
        Takes an acquisition and weights it so the domain and cost are taken into account.
        """
        f_acqu = self._compute_acq(x)
        cost_x, _ = self.cost_withGradients(x)
        return -(f_acqu*self.space.indicator_constraints(x))/cost_x