Fix models which use `layer_type_validation` for Transformers v5 (#37398)

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

vllm/transformers_utils/configs/olmo_hybrid.py

@@ -2,7 +2,7 @@
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
 
-from transformers.configuration_utils import PretrainedConfig, layer_type_validation
+from transformers.configuration_utils import PretrainedConfig
 
 
 class OlmoHybridConfig(PretrainedConfig):
@@ -228,7 +228,15 @@ class OlmoHybridConfig(PretrainedConfig):
             if "full_attention" not in layer_types:
                 layer_types[-1] = "full_attention"
 
-        layer_type_validation(layer_types, num_hidden_layers)
+        if hasattr(self, "validate_layer_type"):
+            # Transformers v5
+            self.layer_types = layer_types
+            self.validate_layer_type()
+        else:
+            # Transformers v4
+            from transformers.configuration_utils import layer_type_validation
+
+            layer_type_validation(layer_types, num_hidden_layers)
         if "linear_attention" not in layer_types:
             raise ValueError(
                 "OLMoHybrid expects at least one 'linear_attention' layer."

vllm/transformers_utils/configs/qwen3_5.py

@@ -16,7 +16,7 @@
 # limitations under the License.
 """Qwen3.5 model configuration"""
 
-from transformers.configuration_utils import PretrainedConfig, layer_type_validation
+from transformers.configuration_utils import PretrainedConfig
 
 
 class Qwen3_5TextConfig(PretrainedConfig):
@@ -68,10 +68,6 @@ class Qwen3_5TextConfig(PretrainedConfig):
         eos_token_id=None,
         **kwargs,
     ):
-        kwargs["ignore_keys_at_rope_validation"] = [
-            "mrope_section",
-            "mrope_interleaved",
-        ]
         self.vocab_size = vocab_size
         self.max_position_embeddings = max_position_embeddings
         self.hidden_size = hidden_size
@@ -98,7 +94,18 @@ class Qwen3_5TextConfig(PretrainedConfig):
                 else "full_attention"
                 for i in range(self.num_hidden_layers)
             ]
-        layer_type_validation(self.layer_types, self.num_hidden_layers)
+        if hasattr(self, "validate_layer_type"):
+            # Transformers v5
+            kwargs["ignore_keys_at_rope_validation"] = {
+                "mrope_section",
+                "mrope_interleaved",
+            }
+            self.validate_layer_type()
+        else:
+            # Transformers v4
+            from transformers.configuration_utils import layer_type_validation
+
+            layer_type_validation(self.layer_types, self.num_hidden_layers)
 
         # linear attention part
         self.linear_conv_kernel_dim = linear_conv_kernel_dim

vllm/transformers_utils/configs/qwen3_5_moe.py

@@ -16,7 +16,7 @@
 # limitations under the License.
 """Qwen3.5-MoE model configuration"""
 
-from transformers.configuration_utils import PretrainedConfig, layer_type_validation
+from transformers.configuration_utils import PretrainedConfig
 
 
 class Qwen3_5MoeTextConfig(PretrainedConfig):
@@ -75,10 +75,6 @@ class Qwen3_5MoeTextConfig(PretrainedConfig):
         eos_token_id=None,
         **kwargs,
     ):
-        kwargs["ignore_keys_at_rope_validation"] = [
-            "mrope_section",
-            "mrope_interleaved",
-        ]
         self.vocab_size = vocab_size
         self.max_position_embeddings = max_position_embeddings
         self.hidden_size = hidden_size
@@ -104,7 +100,18 @@ class Qwen3_5MoeTextConfig(PretrainedConfig):
                 else "full_attention"
                 for i in range(self.num_hidden_layers)
             ]
-        layer_type_validation(self.layer_types, self.num_hidden_layers)
+        if hasattr(self, "validate_layer_type"):
+            # Transformers v5
+            kwargs["ignore_keys_at_rope_validation"] = {
+                "mrope_section",
+                "mrope_interleaved",
+            }
+            self.validate_layer_type()
+        else:
+            # Transformers v4
+            from transformers.configuration_utils import layer_type_validation
+
+            layer_type_validation(self.layer_types, self.num_hidden_layers)
 
         # linear attention part
         self.linear_conv_kernel_dim = linear_conv_kernel_dim

vllm/transformers_utils/configs/qwen3_next.py

@@ -16,7 +16,7 @@
 # limitations under the License.
 """Qwen3-Next model configuration"""
 
-from transformers.configuration_utils import PretrainedConfig, layer_type_validation
+from transformers.configuration_utils import PretrainedConfig
 from transformers.utils import logging
 
 logger = logging.get_logger(__name__)
@@ -253,7 +253,14 @@ class Qwen3NextConfig(PretrainedConfig):
                 "linear_attention" if bool((i + 1) % 4) else "full_attention"
                 for i in range(self.num_hidden_layers)
             ]
-        layer_type_validation(self.layer_types)
+        if hasattr(self, "validate_layer_type"):
+            # Transformers v5
+            self.validate_layer_type()
+        else:
+            # Transformers v4
+            from transformers.configuration_utils import layer_type_validation
+
+            layer_type_validation(self.layer_types)
 
         # linear attention part
         self.linear_conv_kernel_dim = linear_conv_kernel_dim