convert : support Gemma4ForCausalLM architecture (ggml-org#23682)

* convert : support Gemma4ForCausalLM architecture (ggml-org#23674)

* fix indent

---------

Co-authored-by: Oleg Afonin <your.email@example.com>
Co-authored-by: Sigbjørn Skjæret <sigbjorn.skjaeret@scala.com>

Author: 3 people

conversion/__init__.py

@@ -74,6 +74,7 @@
     "Gemma3nForCausalLM": "gemma",
     "Gemma3nForConditionalGeneration": "gemma",
     "Gemma4ForConditionalGeneration": "gemma",
+    "Gemma4ForCausalLM": "gemma",
     "GemmaForCausalLM": "gemma",
     "Glm4ForCausalLM": "glm",
     "Glm4MoeForCausalLM": "glm",

conversion/gemma.py

@@ -614,7 +614,7 @@ def modify_tensors(self, data_torch: Tensor, name: str, bid: int | None) -> Iter
         yield from super().modify_tensors(data_torch, name, bid)
 
 
-@ModelBase.register("Gemma4ForConditionalGeneration")
+@ModelBase.register("Gemma4ForConditionalGeneration", "Gemma4ForCausalLM")
 class Gemma4Model(Gemma3Model):
     model_arch = gguf.MODEL_ARCH.GEMMA4