fix: liger swiglu for llama4 (#2504)

* fix: liger swiglu for llama4

* feat: add liger to deepseek v3

* fix: unpack not found

* fix: spelling

* fix: comment out deepseek v3

* fix: retest deepseek

* fix: map glu

* fix: patch model forward

* chore: add temp code to save

* fix: remove deepseek to move into separate PR

src/axolotl/integrations/liger/__init__.py

@@ -185,5 +185,7 @@ class LigerPlugin(BasePlugin):
                 rms_norm=cfg.liger_rms_norm,
                 layer_norm=cfg.liger_layer_norm,
             )
-        elif cfg.model_config_type in ["deepseek_v3"]:
-            raise ValueError(f"Unsupported model config type: {cfg.model_config_type}")
+        else:
+            logging.warning(
+                f"Unsupported model config type: {cfg.model_config_type}. Liger not applied."
+            )

src/axolotl/integrations/liger/models/llama4.py

@@ -3,6 +3,7 @@ Liger FLCE for llama4
 """
 
 import sys
+from copy import deepcopy
 from typing import List, Optional, Tuple, Union
 
 import torch
@@ -158,7 +159,16 @@ def apply_liger_kernel_to_llama4(
     if rms_norm:
         modeling_llama4.Llama4TextRMSNorm = LigerRMSNorm
     if glu_activation:
-        modeling_llama4.Llama4TextMLP = LigerSwiGLUMLP
+
+        def _liger_swiglu_mlp_wrapper(config, intermediate_size=None, **kwargs):
+            "Accepts intermediate_size to pass to LigerSwiGLUMLP"
+            # clone config to avoid modifying the original
+            config = deepcopy(config)
+            if intermediate_size:
+                setattr(config, "intermediate_size", intermediate_size)
+            return LigerSwiGLUMLP(config, **kwargs)
+
+        modeling_llama4.Llama4TextMLP = _liger_swiglu_mlp_wrapper
     if layer_norm:
         modeling_llama4.nn.LayerNorm = LigerLayerNorm