[model] add gemma3n (#8509)

src/llamafactory/model/model_utils/visual.py

@@ -204,6 +204,13 @@ _register_composite_model(
 )
 
 
+_register_composite_model(
+    model_type="gemma3n",
+    vision_model_keys=["vision_tower", "audio_tower"],
+    lora_conflict_keys=["timm_model", "subsample_conv_projection"],
+)
+
+
 # copied from qwen2vl
 _register_composite_model(
     model_type="glm4v",

src/llamafactory/model/patcher.py

@@ -178,6 +178,9 @@ def patch_model(
         resize_embedding_layer(model, tokenizer)
 
     if is_trainable:
+        if getattr(model.config, "model_type", None) == "gemma3n":
+            setattr(model_args, "disable_gradient_checkpointing", True)
+
         prepare_model_for_training(model, model_args)
         autocast_projector_dtype(model, model_args)
         add_z3_leaf_module(model)