[Fix] optimize visual token mask with caching and multi-token support (#28374)

Signed-off-by: Ferrebo <itachi971009@gmail.com>
Signed-off-by: kebo01 <kebo01@baidu.com>
Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

vllm/model_executor/models/ernie45_vl.py

@@ -1367,6 +1367,23 @@ class Ernie4_5_VLMoeForConditionalGeneration(
         self.make_empty_intermediate_tensors = (
             self.language_model.make_empty_intermediate_tensors
         )
+        if getattr(self.config, "im_patch_id", None):
+            visual_token_ids = [
+                token_id
+                for token_id in [
+                    self.config.im_patch_id,
+                    getattr(self.config, "image_start_token_id", None),
+                    getattr(self.config, "image_end_token_id", None),
+                    getattr(self.config, "video_start_token_id", None),
+                    getattr(self.config, "video_end_token_id", None),
+                ]
+                if token_id is not None
+            ]
+            self._visual_token_ids_tensor_cache = torch.tensor(
+                visual_token_ids, dtype=torch.long
+            )
+        else:
+            self._visual_token_ids_tensor_cache = None
 
     def compute_logits(
         self,
@@ -1398,12 +1415,19 @@ class Ernie4_5_VLMoeForConditionalGeneration(
         return image_features
 
     def _set_visual_token_mask(self, input_ids: torch.Tensor) -> None:
-        if getattr(self.config, "im_patch_id", None) is not None:
-            self.visual_token_mask = (input_ids == self.config.im_patch_id).reshape(
+        """Set mask for visual tokens (image/video patches and delimiters)."""
+        if self._visual_token_ids_tensor_cache is None:
+            self.visual_token_mask = None
+            return
+        # Create tensor on the correct device
+        visual_token_ids_tensor = self._visual_token_ids_tensor_cache.to(
+            device=input_ids.device,
+            dtype=input_ids.dtype,
+        )
+
+        self.visual_token_mask = torch.isin(input_ids, visual_token_ids_tensor).reshape(
             -1, 1
         )
-        else:
-            self.visual_token_mask = None
 
     def get_mrope_input_positions(
         self,