[Model] use AutoWeightsLoader for commandr (#19399)

Signed-off-by: py-andy-c <pychen1017@gmail.com>

vllm/model_executor/models/commandr.py

@@ -51,7 +51,8 @@ from vllm.platforms import current_platform
 from vllm.sequence import IntermediateTensors
 
 from .interfaces import SupportsLoRA, SupportsPP, SupportsQuant
-from .utils import (extract_layer_index, is_pp_missing_parameter,
+from .utils import (AutoWeightsLoader, extract_layer_index,
+                    is_pp_missing_parameter,
                     make_empty_intermediate_tensors_factory, make_layers,
                     maybe_prefix)
 
@@ -286,6 +287,7 @@ class CohereModel(nn.Module):
         cache_config = vllm_config.cache_config
         quant_config = vllm_config.quant_config
         lora_config = vllm_config.lora_config
+        self.quant_config = quant_config
 
         self.config = config
         lora_vocab = (lora_config.lora_extra_vocab_size *
@@ -339,6 +341,62 @@ class CohereModel(nn.Module):
         hidden_states, _ = self.norm(hidden_states, residual)
         return hidden_states
 
+    def load_weights(self, weights: Iterable[tuple[str,
+                                                   torch.Tensor]]) -> set[str]:
+        stacked_params_mapping = [
+            # (param_name, shard_name, shard_id)
+            ("qkv_proj", "q_proj", "q"),
+            ("qkv_proj", "k_proj", "k"),
+            ("qkv_proj", "v_proj", "v"),
+            ("gate_up_proj", "gate_proj", 0),
+            ("gate_up_proj", "up_proj", 1),
+        ]
+        params_dict = dict(self.named_parameters())
+        loaded_params: set[str] = set()
+        for name, loaded_weight in weights:
+            if (self.quant_config is not None and
+                (scale_name := self.quant_config.get_cache_scale(name))):
+                # Loading kv cache quantization scales
+                param = params_dict[scale_name]
+                weight_loader = getattr(param, "weight_loader",
+                                        default_weight_loader)
+                loaded_weight = (loaded_weight if loaded_weight.dim() == 0 else
+                                 loaded_weight[0])
+                weight_loader(param, loaded_weight)
+                loaded_params.add(scale_name)
+                continue
+
+            for param_name, shard_name, shard_id in stacked_params_mapping:
+                if shard_name not in name:
+                    continue
+                name = name.replace(shard_name, param_name)
+                # 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 = param.weight_loader
+                weight_loader(param, loaded_weight, shard_id)
+                break
+            else:
+                # Skip loading extra bias for GPTQ models.
+                if name.endswith(".bias") and name not in params_dict:
+                    continue
+                # Remapping the name of FP8 kv-scale.
+                name = maybe_remap_kv_scale_name(name, params_dict)
+                if name is None:
+                    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 CohereForCausalLM(nn.Module, SupportsLoRA, SupportsPP, SupportsQuant):
     packed_modules_mapping = {
@@ -408,65 +466,6 @@ class CohereForCausalLM(nn.Module, SupportsLoRA, SupportsPP, SupportsQuant):
 
     def load_weights(self, weights: Iterable[tuple[str,
                                                    torch.Tensor]]) -> set[str]:
-        stacked_params_mapping = [
-            # (param_name, shard_name, shard_id)
-            ("qkv_proj", "q_proj", "q"),
-            ("qkv_proj", "k_proj", "k"),
-            ("qkv_proj", "v_proj", "v"),
-            ("gate_up_proj", "gate_proj", 0),
-            ("gate_up_proj", "up_proj", 1),
-        ]
-        params_dict = dict(self.named_parameters())
-        loaded_params: set[str] = set()
-        for name, loaded_weight in weights:
-
-            # Skip loading rotary embeddings since vLLM has its own
-            if "rotary_emb.inv_freq" in name:
-                continue
-
-            if (self.quant_config is not None and
-                (scale_name := self.quant_config.get_cache_scale(name))):
-                # Loading kv cache quantization scales
-                param = params_dict[scale_name]
-                weight_loader = getattr(param, "weight_loader",
-                                        default_weight_loader)
-                loaded_weight = (loaded_weight if loaded_weight.dim() == 0 else
-                                 loaded_weight[0])
-                weight_loader(param, loaded_weight)
-                loaded_params.add(scale_name)
-                continue
-
-            for param_name, shard_name, shard_id in stacked_params_mapping:
-                if shard_name not in name:
-                    continue
-                name = name.replace(shard_name, param_name)
-                # 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 = param.weight_loader
-                weight_loader(param, loaded_weight, shard_id)
-                break
-            else:
-                # lm_head is not used in vllm as it is tied with embed_token.
-                # To prevent errors, skip loading lm_head.weight.
-                if "lm_head.weight" in name:
-                    continue
-                # Skip loading extra bias for GPTQ models.
-                if name.endswith(".bias") and name not in params_dict:
-                    continue
-                # Remapping the name of FP8 kv-scale.
-                name = maybe_remap_kv_scale_name(name, params_dict)
-                if name is None:
-                    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, skip_prefixes=["lm_head", "rotary_emb.inv_freq"])
+        return loader.load_weights(weights)