Atropos support (#2666) [skip ci]

* allow peft+liger+grpo and custom vllm serve for atropos support

* set trainer class for RL

src/axolotl/cli/args.py

@@ -82,6 +82,12 @@ class VllmServeCliArgs:
             "hardware support this feature."
         },
     )
+    serve_module: Optional[str] = field(
+        default=None,
+        metadata={
+            "help": "Module to serve. If not set, the default module will be used."
+        },
+    )
 
 
 @dataclass

src/axolotl/cli/vllm_serve.py

@@ -6,7 +6,6 @@ from pathlib import Path
 from typing import Union
 
 from trl.scripts.vllm_serve import ScriptArguments
-from trl.scripts.vllm_serve import main as vllm_serve_main
 
 from axolotl.cli.config import load_cfg
 
@@ -28,6 +27,9 @@ def do_vllm_serve(
     cfg = load_cfg(config)
     model = cfg.base_model
 
+    serve_module = cli_args.get("serve_module", "trl.scripts.vllm_serve")
+    vllm_serve_main = getattr(__import__(serve_module, fromlist=["main"]), "main")
+
     tensor_parallel_size = (
         cli_args.get("tensor_parallel_size") or cfg.vllm.tensor_parallel_size
     )

src/axolotl/core/trainer_builder.py

@@ -1197,6 +1197,10 @@ class HFRLTrainerBuilder(TrainerBuilderBase):
         else:
             raise ValueError(f"Unsupported RL: {self.cfg.rl}")
 
+        if self.cfg.plugins:
+            plugin_manager = PluginManager.get_instance()
+            trainer_cls = plugin_manager.get_trainer_cls(self.cfg)
+
         sig = inspect.signature(trainer_cls)
         if "tokenizer" in sig.parameters.keys():
             trainer_kwargs["tokenizer"] = self.tokenizer

src/axolotl/utils/schemas/config.py

@@ -1149,18 +1149,18 @@ class AxolotlInputConfig(
 
         return data
 
-    @model_validator(mode="before")
+    # @model_validator(mode="before")
-    @classmethod
+    # @classmethod
-    def check_grpo_peft_liger(cls, data):
+    # def check_grpo_peft_liger(cls, data):
-        if (
+    #     if (
-            data.get("rl") == "grpo"
+    #         data.get("rl") == "grpo"
-            and data.get("trl", {})
+    #         and data.get("trl", {})
-            and data.get("trl").get("use_liger_loss")
+    #         and data.get("trl").get("use_liger_loss")
-            and data.get("adapter")
+    #         and data.get("adapter")
-        ):
+    #     ):
-            raise ValueError("PEFT + GRPO + Liger is not yet supported")
+    #         raise ValueError("PEFT + GRPO + Liger is not yet supported")
-        return data
+    #     return data
-
+    #
     @model_validator(mode="before")
     @classmethod
     def check_grpo_liger_sequence_parallel(cls, data):