[V0 Deprecation] Remove unused MM placeholders in request output (#34944)

Signed-off-by: DarkLight1337 <tlleungac@connect.ust.hk>

vllm/outputs.py

@@ -13,7 +13,6 @@ from typing_extensions import TypeVar
 from vllm.logger import init_logger
 from vllm.logprobs import PromptLogprobs, SampleLogprobs
 from vllm.lora.request import LoRARequest
-from vllm.multimodal.inputs import MultiModalPlaceholderDict
 from vllm.v1.metrics.stats import RequestStateStats
 
 logger = init_logger(__name__)
@@ -121,7 +120,6 @@ class RequestOutput:
         encoder_prompt_token_ids: list[int] | None = None,
         num_cached_tokens: int | None = None,
         *,
-        multi_modal_placeholders: MultiModalPlaceholderDict | None = None,
         kv_transfer_params: dict[str, Any] | None = None,
         # Forward compatibility, code that uses args added in new release can
         # still run with older versions of vLLM without breaking.
@@ -134,7 +132,6 @@ class RequestOutput:
         self.request_id = request_id
         self.prompt = prompt
         self.prompt_token_ids = prompt_token_ids
-        self.multi_modal_placeholders = multi_modal_placeholders or {}
         self.prompt_logprobs = prompt_logprobs
         self.outputs = outputs
         self.finished = finished
@@ -187,8 +184,7 @@ class RequestOutput:
             f"finished={self.finished}, "
             f"metrics={self.metrics}, "
             f"lora_request={self.lora_request}, "
-            f"num_cached_tokens={self.num_cached_tokens}, "
-            f"multi_modal_placeholders={self.multi_modal_placeholders})"
+            f"num_cached_tokens={self.num_cached_tokens})"
         )