[FIXBUG] Add return_success parameter to moe_wna16_weight_loader function (#22797)

Signed-off-by: JartX <sagformas@epdcenter.es>
Co-authored-by: Michael Goin <mgoin64@gmail.com>

vllm/model_executor/layers/quantization/moe_wna16.py

@@ -175,11 +175,8 @@ class MoeWNA16Method(FusedMoEMethodBase):
         quant_config: The MOE WNA16 (W8A16/W4A16) quantization config.
     """
 
-    def __init__(
-        self,
-        quant_config: MoeWNA16Config,
-        moe: FusedMoEConfig,
-    ):
+    def __init__(self, quant_config: MoeWNA16Config,
+                 moe: "FusedMoEConfig") -> None:
         super().__init__(moe)
         self.quant_config = quant_config
 
@@ -187,6 +184,7 @@ class MoeWNA16Method(FusedMoEMethodBase):
                        hidden_size: int, intermediate_size_per_partition: int,
                        params_dtype: torch.dtype, **extra_weight_attrs):
 
+        self.moe = layer
         layer.quant_config = self.quant_config
         bit8_pack_factor = self.quant_config.bit8_pack_factor
         group_size = self.quant_config.group_size
@@ -308,7 +306,6 @@ class MoeWNA16Method(FusedMoEMethodBase):
         logical_replica_count: Optional[torch.Tensor] = None,
     ) -> torch.Tensor:
         assert self.fused_experts is None
-
         if enable_eplb:
             raise NotImplementedError(
                 "EPLB not supported for `MoeWNA16Method` yet.")
@@ -404,12 +401,14 @@ class MoeWNA16Method(FusedMoEMethodBase):
 
         def moe_wna16_weight_loader(param: torch.nn.Parameter,
                                     loaded_weight: torch.Tensor,
-                                    weight_name: str, shard_id: str,
-                                    expert_id: int):
+                                    weight_name: str,
+                                    shard_id: str,
+                                    expert_id: int,
+                                    return_success: bool = False):
             if "g_idx" in weight_name:
-                return
+                return False if return_success else None
             if not layer.quant_config.has_zp and "qzeros" in weight_name:
-                return
+                return False if return_success else None
 
             device = get_tp_group().device
             tp_rank = get_tensor_model_parallel_rank()
@@ -455,11 +454,18 @@ class MoeWNA16Method(FusedMoEMethodBase):
                     param.data[expert_id, :shard_size // 2] = tensor
                 else:
                     param.data[expert_id, shard_size // 2:] = tensor
+                return True if return_success else None
             elif "w2_qzeros" in weight_name:
                 param.data[expert_id] = loaded_weight.view(
                     loaded_weight.size(0), layer.tp_size, -1)[:, tp_rank]
+                return True if return_success else None
             else:
-                weight_loader(param, loaded_weight, weight_name, shard_id,
-                              expert_id)
+                # Delegate to the original loader, passing return_success
+                return weight_loader(param,
+                                     loaded_weight,
+                                     weight_name,
+                                     shard_id,
+                                     expert_id,
+                                     return_success=return_success)
 
         return moe_wna16_weight_loader