Use Transformers helper `get_text_config()` instead of checking for `text_config` (#17105)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

benchmarks/kernels/benchmark_moe.py

@@ -553,9 +553,8 @@ def main(args: argparse.Namespace):
         intermediate_size = config.moe_intermediate_size
         shard_intermediate_size = 2 * intermediate_size // args.tp_size
     else:
-        if not hasattr(config, "hidden_size"):
-            # Support for llama4
-            config = config.text_config
+        # Support for llama4
+        config = config.get_text_config()
         # Default: Mixtral.
         E = config.num_local_experts
         topk = config.num_experts_per_tok

tests/models/test_initialization.py

@@ -24,10 +24,7 @@ def test_can_initialize(model_arch):
     def hf_overrides(hf_config: PretrainedConfig) -> PretrainedConfig:
         hf_config.update(model_info.hf_overrides)
 
-        if hasattr(hf_config, "text_config"):
-            text_config: PretrainedConfig = hf_config.text_config
-        else:
-            text_config = hf_config
+        text_config = hf_config.get_text_config()
 
         text_config.update({
             "num_layers": 1,

vllm/config.py

@@ -2841,12 +2841,10 @@ def _get_and_verify_dtype(
 ) -> torch.dtype:
     # NOTE: getattr(config, "torch_dtype", torch.float32) is not correct
     # because config.torch_dtype can be None.
-    config_dtype = getattr(config, "torch_dtype", None)
+    config_dtype = getattr(config.get_text_config(), "torch_dtype", None)
 
-    # Fallbacks for multi-modal models if the root config
+    # Fallback for multi-modal models if the root config
     # does not define torch_dtype
-    if config_dtype is None and hasattr(config, "text_config"):
-        config_dtype = getattr(config.text_config, "torch_dtype", None)
     if config_dtype is None and hasattr(config, "vision_config"):
         config_dtype = getattr(config.vision_config, "torch_dtype", None)
 

vllm/transformers_utils/config.py

@@ -760,19 +760,22 @@ def get_hf_text_config(config: PretrainedConfig):
     """Get the "sub" config relevant to llm for multi modal models.
     No op for pure text models.
     """
-    if hasattr(config, "text_config"):
-        # The code operates under the assumption that text_config should have
-        # `num_attention_heads` (among others). Assert here to fail early
-        # if transformers config doesn't align with this assumption.
-        assert hasattr(config.text_config, "num_attention_heads")
-        return config.text_config
-    elif hasattr(config, "thinker_config"):
+    # This block should be unnecessary after https://github.com/huggingface/transformers/pull/37517
+    if hasattr(config, "thinker_config"):
         # TODO(suyang.fy): Refactor code.
         #  For Qwen2.5-Omni, change hf_text_config to
         #  thinker_config.text_config.
         return config.thinker_config.text_config
-    else:
-        return config
+
+    text_config = config.get_text_config()
+
+    if text_config is not config:
+        # The code operates under the assumption that text_config should have
+        # `num_attention_heads` (among others). Assert here to fail early
+        # if transformers config doesn't align with this assumption.
+        assert hasattr(text_config, "num_attention_heads")
+
+    return text_config
 
 
 def try_get_generation_config(

vllm/worker/cpu_model_runner.py

@@ -508,13 +508,8 @@ class CPUModelRunnerBase(ModelRunnerBase[TModelInputForCPU]):
                 logger.warning("Regarding multimodal models, vLLM currently "
                                "only supports adding LoRA to language model.")
 
-            # It's necessary to distinguish between the max_position_embeddings
-            # of VLMs and LLMs.
-            if hasattr(self.model.config, "max_position_embeddings"):
-                max_pos_embeddings = self.model.config.max_position_embeddings
-            else:
-                max_pos_embeddings = (
-                    self.model.config.text_config.max_position_embeddings)
+            # Use get_text_config() in case of multimodal models
+            text_config = self.model_config.hf_config.get_text_config()
 
             self.lora_manager = LRUCacheWorkerLoRAManager(
                 self.scheduler_config.max_num_seqs,
@@ -524,7 +519,7 @@ class CPUModelRunnerBase(ModelRunnerBase[TModelInputForCPU]):
                 self.device,
                 self.model.embedding_modules,
                 self.model.embedding_padding_modules,
-                max_position_embeddings=max_pos_embeddings,
+                max_position_embeddings=text_config.max_position_embeddings,
             )
             self.model = self.lora_manager.create_lora_manager(self.model)
 

vllm/worker/hpu_model_runner.py

@@ -724,14 +724,9 @@ class HPUModelRunnerBase(ModelRunnerBase[TModelInputForHPU]):
                     "Bias support in LoRA is not enabled in HPU yet."
                 assert not self.lora_config.fully_sharded_loras, \
                     "Fully sharded LoRAs is not enabled in HPU yet."
-                # It's necessary to distinguish between the
-                # max_position_embeddings of VLMs and LLMs.
-                if hasattr(self.model.config, "max_position_embeddings"):
-                    max_pos_embeddings = (
-                        self.model.config.max_position_embeddings)
-                else:
-                    max_pos_embeddings = (
-                        self.model.config.text_config.max_position_embeddings)
+
+                # Use get_text_config() in case of multimodal models
+                text_config = self.model_config.hf_config.get_text_config()
 
                 self.lora_manager = LRUCacheWorkerLoRAManager(
                     self.scheduler_config.max_num_seqs,
@@ -741,7 +736,8 @@ class HPUModelRunnerBase(ModelRunnerBase[TModelInputForHPU]):
                     self.device,
                     self.model.embedding_modules,
                     self.model.embedding_padding_modules,
-                    max_position_embeddings=max_pos_embeddings,
+                    max_position_embeddings=text_config.
+                    max_position_embeddings,
                 )
                 self.model = self.lora_manager.create_lora_manager(self.model)
 

vllm/worker/model_runner.py

@@ -1130,14 +1130,9 @@ class GPUModelRunnerBase(ModelRunnerBase[TModelInputForGPU]):
                     logger.warning(
                         "Regarding multimodal models, vLLM currently "
                         "only supports adding LoRA to language model.")
-                # It's necessary to distinguish between the
-                # max_position_embeddings of VLMs and LLMs.
-                if hasattr(self.model.config, "max_position_embeddings"):
-                    max_pos_embeddings = (
-                        self.model.config.max_position_embeddings)
-                else:
-                    max_pos_embeddings = (
-                        self.model.config.text_config.max_position_embeddings)
+
+                # Use get_text_config() in case of multimodal models
+                text_config = self.model_config.hf_config.get_text_config()
 
                 self.lora_manager = LRUCacheWorkerLoRAManager(
                     self.scheduler_config.max_num_seqs,
@@ -1147,7 +1142,8 @@ class GPUModelRunnerBase(ModelRunnerBase[TModelInputForGPU]):
                     self.device,
                     self.model.embedding_modules,
                     self.model.embedding_padding_modules,
-                    max_position_embeddings=max_pos_embeddings,
+                    max_position_embeddings=text_config.
+                    max_position_embeddings,
                 )
                 self.model = self.lora_manager.create_lora_manager(self.model)
             time_after_load = time.perf_counter()