add gemma3 to registry

unsloth/registry/_gemma.py

@@ -0,0 +1,54 @@
+from unsloth.registry.registry import ModelInfo, ModelMeta, QuantType, _register_models
+
+_IS_GEMMA_REGISTERED = False
+
+class GemmaModelInfo(ModelInfo):
+    @classmethod
+    def construct_model_name(cls, base_name, version, size, quant_type, instruct_tag):
+        key = f"{base_name}-{version}-{size}B"
+        key = cls.append_instruct_tag(key, instruct_tag)
+        key = cls.append_quant_type(key, quant_type)
+        return key
+
+# Gemma3 Base Model Meta
+GemmaMeta3Base = ModelMeta(
+    org="google",
+    base_name="gemma",
+    instruct_tags=["pt"],  # pt = base
+    model_version="3",
+    model_sizes=["1", "4", "12", "27"],
+    model_info_cls=GemmaModelInfo,
+    is_multimodal=True,
+    quant_types=[QuantType.NONE, QuantType.BNB, QuantType.UNSLOTH],
+)
+
+# Gemma3 Instruct Model Meta
+GemmaMeta3Instruct = ModelMeta(
+    org="google",
+    base_name="gemma",
+    instruct_tags=["it"],  # it = instruction tuned
+    model_version="3",
+    model_sizes=["1", "4", "12", "27"],
+    model_info_cls=GemmaModelInfo,
+    is_multimodal=True,
+    quant_types=[QuantType.NONE, QuantType.BNB, QuantType.UNSLOTH, QuantType.GGUF],
+)
+
+def register_gemma_models(include_original_model: bool = False):
+    global _IS_GEMMA_REGISTERED
+    if _IS_GEMMA_REGISTERED:
+        return
+    _register_models(GemmaMeta3Base, include_original_model=include_original_model)
+    _register_models(GemmaMeta3Instruct, include_original_model=include_original_model)
+    _IS_GEMMA_REGISTERED = True
+
+register_gemma_models(include_original_model=True)
+
+if __name__ == "__main__":
+    from unsloth.registry.registry import MODEL_REGISTRY, _check_model_info
+    for model_id, model_info in MODEL_REGISTRY.items():
+        model_info = _check_model_info(model_id)
+        if model_info is None:
+            print(f"\u2718 {model_id}")
+        else:
+            print(f"\u2713 {model_id}")