activation order GPTQ heuristic
quantizes columns in order of decreasing activation size
if actorder: perm = torch.argsort(torch.diag(H), descending=True) W = W[:, perm] H = H[perm][:, perm]
if actorder: perm = torch.argsort(torch.diag(H), descending=True) W = W[:, perm] H = H[perm][:, perm]