fix saving issue for group_size=-1 (#2138)

Signed-off-by: xin3he <xin3.he@intel.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: xin3he

neural_compressor/transformers/quantization/utils.py

@@ -660,9 +660,13 @@ def convert_to_GPTQ_checkpoints(model, quantization_config):
             new_module.n_pack = 32 // bits
             scales = module._op_context.get_scales().t().contiguous()
             bias = module._op_context.get_bias()
-            qzeros = new_module.pack_tensor_with_numpy(
-                module._op_context.get_zero_points().t().to(torch.uint8) - 1
-            ).contiguous()
+            qzeros = module._op_context.get_zero_points().t().to(torch.uint8)
+            # For group_size = -1, the dimensions of scale and qzeros will be 1
+            if len(scales.shape) == 1:
+                scales = scales.unsqueeze(0)
+            if len(qzeros.shape) == 1:
+                qzeros = qzeros.unsqueeze(0)
+            qzeros = new_module.pack_tensor_with_numpy(qzeros - 1).contiguous()
             g_idx = module._op_context.get_g_idx()
 
             new_module.qweight = qweight