round the losses to 12 digits to make them equal

        def finite_loss(loss, xs):

            # If the loss is infinite we return the

            # distance between the two points.

            return (loss if not math.isinf(loss)

                    else (xs[1] - xs[0]) / self._scale[0])

            if math.isinf(loss):

                loss = (xs[1] - xs[0]) / self._scale[0]

            # We round the loss to 12 digits such that losses

            # are equal up to numerical precision will be considered

            # equal.

            return round(loss, ndigits=12)

        quals = [(-finite_loss(loss, x), x, 1)

                 for x, loss in self.losses_combined.items()]