fix: 修复丢弃MTP代码报错

vllm/v1/worker/gpu_model_runner.py

@@ -1638,9 +1638,6 @@ class GPUModelRunnerBase(LoRAModelRunnerMixin):
         # Mask out the sampled tokens that should not be sampled.
         for i in discard_sampled_tokens_req_indices:
             valid_sampled_token_ids[i].clear()
-        if spec_token_ids is not None:
-            for i in discard_sampled_tokens_req_indices:
-                spec_token_ids[i].clear()
 
         # Cache the sampled tokens in the model runner, so that the scheduler
         # doesn't need to send them back.
@@ -1680,7 +1677,9 @@ class GPUModelRunnerBase(LoRAModelRunnerMixin):
                 spec_decode_metadata,
                 attn_metadata,
             )
-
+        if spec_token_ids is not None:
+            for i in discard_sampled_tokens_req_indices:
+                spec_token_ids[i].clear()
         # Clear KVConnector state after all KVs are generated.
         if has_kv_transfer_group():
             get_kv_transfer_group().clear_connector_metadata()