//  [python]
def gptqquant(self, blocksize=128, percdamp=.01, groupsize=-1, actorder=False, name=''):
        self.layer.to(self.dev)

        W = self.layer.weight.data.clone()
        if isinstance(self.layer, nn.Conv2d):
            W = W.flatten(1)
        if isinstance(self.layer, transformers.Conv1D):
            W = W.t()
        W = W.float()

        tick = time.time()

        if not self.quantizer.ready():
            self.quantizer.find_params(W, weight=True)

        H = self.H
        if not self.observe:
            del self.H
        dead = torch.diag(H) == 0
        H[dead, dead] = 1
        W[:, dead] = 0

        if actorder:
            perm = torch.argsort(torch.diag(H), descending=True)
            W = W[:, perm]
            H = H[perm][:, perm]

        Losses = torch.zeros_like(W)
        Q = torch.zeros_like(W)

        damp = percdamp * torch.mean(torch.diag(H))
        diag = torch.arange(self.columns, device=self.dev)
        H[diag, diag] += damp
        H = torch.linalg.cholesky(H)
        H = torch.cholesky_inverse(H)
        H = torch.linalg.cholesky(H, upper=True)
        Hinv = H

        g_idx = []
        scale = []
        zero = []
        now_idx = 1

        for i1 in range(0, self.columns, blocksize):
            i2 = min(i1 + blocksize, self.columns)
            count = i2 - i1

            W1 = W[:, i1:i2].clone()
            Q1 = torch.zeros_like(W1)
            Err1 = torch.zeros_like(W1)
            Losses1 = torch.zeros_like(W1)
            Hinv1 = Hinv[i1:i2, i1:i2]

            for i in range(count):
                w = W1[:, i]
                d = Hinv1[i, i]

                if groupsize != -1:
                    if (i1 + i) % groupsize == 0:
                        self.quantizer.find_params(W[:, (i1 + i):(i1 + i + groupsize)], weight=True)

                    if ((i1 + i) // groupsize) - now_idx == -1:
                        scale.append(self.quantizer.scale)
                        zero.append(self.quantizer.zero)
                        now_idx += 1

                q = self.quantizer.quantize(w.unsqueeze(1)).flatten()
                Q1[:, i] = q
                Losses1[:, i] = (w - q)**2 / d**2

                err1 = (w - q) / d
                W1[:, i:] -= err1.unsqueeze(1).matmul(Hinv1[i, i:].unsqueeze(0))
                Err1[:, i] = err1

            Q[:, i1:i2] = Q1
            Losses[:, i1:i2] = Losses1 / 2

            W[:, i2:] -= Err1.matmul(Hinv[i1:i2, i2:])

        torch.cuda.synchronize()
        error = torch.sum(Losses).item()

        groupsize = groupsize if groupsize != -1 else self.columns
        g_idx = [i // groupsize for i in range(self.columns)]
        g_idx = torch.tensor(g_idx, dtype=torch.int32, device=Q.device)
        if actorder:
            invperm = torch.argsort(perm)
            Q = Q[:, invperm]
            g_idx = g_idx[invperm]

        if isinstance(self.layer, transformers.Conv1D):
            Q = Q.t()

        self.print_loss(name=name, q_weight=Q, weight_error=error, timecost=(time.time() - tick))

        if scale == []:
            scale.append(self.quantizer.scale)
            zero.append(self.quantizer.zero)
        scale = torch.cat(scale, dim=1)
        zero = torch.cat(zero, dim=1)
        return scale, zero, g_idx, error