[Model] Use autoweightloader for mamba (vllm-project#16950)

Signed-off-by: sfeng33 <[email protected]>
Signed-off-by: Mu Huai <[email protected]>

Author: sfeng33

vllm/model_executor/models/mamba.py

@@ -27,7 +27,7 @@
 from vllm.sequence import IntermediateTensors
 from vllm.utils import LayerBlockType
 
-from .utils import (is_pp_missing_parameter,
+from .utils import (AutoWeightsLoader, is_pp_missing_parameter,
                     make_empty_intermediate_tensors_factory, make_layers,
                     maybe_prefix)
 
@@ -154,6 +154,26 @@ def forward(
 
         return hidden_states
 
+    def load_weights(self, weights: Iterable[Tuple[str,
+                                                   torch.Tensor]]) -> Set[str]:
+        params_dict = dict(self.named_parameters())
+        loaded_params: Set[str] = set()
+        for name, loaded_weight in weights:
+            if "A_log" in name:
+                name = name.replace("A_log", "A")
+            # Skip loading extra bias for GPTQ models.
+            if name.endswith(".bias") and name not in params_dict:
+                continue
+            if is_pp_missing_parameter(name, self):
+                continue
+
+            param = params_dict[name]
+            weight_loader = getattr(param, "weight_loader",
+                                    default_weight_loader)
+            weight_loader(param, loaded_weight)
+            loaded_params.add(name)
+        return loaded_params
+
 
 class MambaForCausalLM(nn.Module, HasInnerState, IsAttentionFree, SupportsPP,
                        SupportsV0Only):
@@ -257,20 +277,5 @@ def sample(
 
     def load_weights(self, weights: Iterable[Tuple[str,
                                                    torch.Tensor]]) -> Set[str]:
-        params_dict = dict(self.named_parameters())
-        loaded_params: Set[str] = set()
-        for name, loaded_weight in weights:
-            if "A_log" in name:
-                name = name.replace("A_log", "A")
-            # Skip loading extra bias for GPTQ models.
-            if name.endswith(".bias") and name not in params_dict:
-                continue
-            if is_pp_missing_parameter(name, self):
-                continue
-
-            param = params_dict[name]
-            weight_loader = getattr(param, "weight_loader",
-                                    default_weight_loader)
-            weight_loader(param, loaded_weight)
-            loaded_params.add(name)
-        return loaded_params
+        loader = AutoWeightsLoader(self)
+        return loader.load_weights(weights)