//  [python]
def fasterquant(
        self, blocksize=128, percdamp=.01, groupsize=-1, actorder=False
    ):
        assert actorder==False, "we don't deal with actorder inside GPTQ for our implementation."
        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()
                
        if not self.quantizer.ready():
            self.quantizer.find_params(W[:,:self.n_nonout], weight=True)

        H = self.H.clone()
        del self.H

        dead = torch.diag(H) == 0
        H[dead, dead] = 1
        W[:, dead] = 0 

        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
        
        for i1 in range(0, self.n_nonout, blocksize):
            i2 = min(i1 + blocksize, self.n_nonout)
            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 > 0:
                    if (i1 + i) % groupsize == 0:
                        self.quantizer.find_params(W[:, (i1 + i):min((i1 + i + groupsize), self.n_nonout)], weight=True)
                q = quantize_gptq(
                    w.unsqueeze(1), self.quantizer.scale, self.quantizer.zero,
                    self.quantizer.maxq, self.quantizer.channel_group, self.quantizer.quant_type
                ).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()
        # print('time %.2f' % (time.time() - tick))
        # print('error', torch.sum(Losses).item())
        
        if self.n_out > 0:
            keep_w = W[:,self.n_nonout:].contiguous()

            if self.keeper_precision > 0:
                if self.keeper_precision == 1:
                    keep_w = fake_quantize_quarter_E5M2(keep_w)
                elif self.keeper_precision == 2:
                    keep_w = fake_quantize_quarter_E4M3(keep_w)
                elif self.keeper_precision == 3:
                    keep_w = quantize_tensor(keep_w, n_bits=8, group_size=0, tiling=0, sym=True, exponential=False)

            Q[:,self.n_nonout:] = keep_w

        Q = Q.reshape(self.layer.weight.shape).to(self.layer.weight.data.dtype)
        
        if isinstance(self.layer, transformers.Conv1D):
            Q = Q.t()
        
        self.layer.weight.data = Q.reshape(self.layer.weight.shape).to(self.layer.weight.data.dtype)
        del H
        del Losses
        del W