Retrieve `sliding_window` from text config in Gemma3 MM (#25085)

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

vllm/model_executor/models/gemma3_mm.py

@@ -688,7 +688,8 @@ class Gemma3ForConditionalGeneration(nn.Module, SupportsMultiModal, SupportsPP,
             global_attn_mask = torch.where(img_mask == 2, 0, global_attn_mask)
             global_attn_masks.append(global_attn_mask)
 
-            if (sliding_window := self.config.sliding_window) is not None:
+            sliding_window = self.config.text_config.sliding_window
+            if sliding_window is not None:
                 # Create a local causal mask with sliding window (1024).
                 local_attn_mask = torch.ones_like(global_attn_mask)
                 local_attn_mask = torch.tril(local_attn_mask,

vllm/model_executor/models/gemma3n_mm.py

@@ -461,9 +461,6 @@ class Gemma3nForConditionalGeneration(nn.Module, SupportsMultiModal,
         self.multimodal_config = multimodal_config
         self.vocab_size = config.text_config.vocab_size
 
-        self.sliding_window = getattr(config.text_config,
-                                      "interleaved_sliding_window", None)
-
         self.vision_tower = AutoModel.from_config(config=config.vision_config)
         self.audio_tower = AutoModel.from_config(config=config.audio_config)
         self.embed_vision = Gemma3nMultimodalEmbedder(config.vision_config,