[Bugfix] gptq_marlin: Ensure g_idx_sort_indices is not a Parameter (#5108)

vllm/model_executor/layers/quantization/gptq_marlin.py

@@ -298,14 +298,10 @@ class GPTQMarlinLinearMethod(LinearMethodBase):
             },
         )
 
-        g_idx_sort_indices = Parameter(
-            torch.empty(
+        g_idx_sort_indices = torch.empty(
             g_idx.shape,
             dtype=torch.int32,
-            ),
-            requires_grad=False,
         )
-        set_weight_attrs(g_idx_sort_indices, extra_weight_attrs)
 
         # Scales
         scales = Parameter(
@@ -356,9 +352,9 @@ class GPTQMarlinLinearMethod(LinearMethodBase):
 
         layer.register_parameter("qweight", qweight)
         layer.register_parameter("g_idx", g_idx)
-        layer.register_parameter("g_idx_sort_indices", g_idx_sort_indices)
         layer.register_parameter("scales", scales)
         layer.register_parameter("qzeros", qzeros)
+        layer.g_idx_sort_indices = g_idx_sort_indices
         layer.workspace = workspace
         layer.input_size_per_partition = input_size_per_partition
         layer.output_size_per_partition = output_size_per_partition