fix: fastmoe lora all-linear excluding router

tuning/sft_trainer.py

@@ -170,24 +170,14 @@ def train(
     if fast_moe_config is not None and fast_moe_config.fast_moe is None:
         fast_moe_config = None
     if fast_moe_config is not None:
-        # Checking for unsupported modules with Scatter MoE for LoRA
-        # Only raise an error for `all-linear`
-        restricted_modules = ["all-linear"]
+        # If LoRA with ScatterMoE detected, raise warning
+        accepted_layers = ["all-linear"]
         if (
             peft_config is not None
             and hasattr(peft_config, "target_modules")
-            and any(
-                module in (peft_config.target_modules or [])
-                for module in restricted_modules
-            )
+            and fast_moe_config.fast_moe is not None
+            and peft_config.target_modules != accepted_layers
         ):
-            raise ValueError(
-                "`--fast_moe` with LoRA does not currently support `all-linear`, as "
-                "target modules at this time. Please explicitly specify target "
-                "modules when using `--fast_moe` with LoRA."
-            )
-        # If other common non-linear modules, raise warning
-        if peft_config is not None and hasattr(peft_config, "target_modules"):
             logger.warning(
                 "You are running lora with the ScatterMoE plugin, please note that "
                 "passing target modules that are part of the moe module can cause unexpected "