[Deprecation][1/2] Remove items deprecated in v0.18 (#36470)

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

vllm/plugins/io_processors/__init__.py

@@ -1,7 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 # SPDX-FileCopyrightText: Copyright contributors to the vLLM project
 
-import inspect
 import logging
 
 from vllm.config import VllmConfig
@@ -67,16 +66,6 @@ def get_io_processor(
             f"Available plugins: {list(loadable_plugins.keys())}"
         )
 
-    activated_plugin_cls = loadable_plugins[model_plugin]
+    activated_plugin_cls = resolve_obj_by_qualname(loadable_plugins[model_plugin])
 
-    activated_plugin_typ = resolve_obj_by_qualname(activated_plugin_cls)
-
-    # for backward compatibility, the plugin does not have a renderer argument
-    if "renderer" not in inspect.signature(activated_plugin_typ.__init__).parameters:
-        logger.warning(
-            "The renderer argument will be required in v0.18, "
-            "please update your IOProcessor plugin: %s",
-            activated_plugin_cls,
-        )
-        return activated_plugin_typ(vllm_config)
-    return activated_plugin_typ(vllm_config, renderer)
+    return activated_plugin_cls(vllm_config, renderer)