conversion: only allow selected models

convert_hf_to_gguf.py

@@ -373,6 +373,9 @@ class Model:
         except KeyError:
             raise NotImplementedError(f'Architecture {arch!r} not supported!') from None
 
+    def support_lora(self) -> bool:
+        return False
+
     # used for GPT-2 BPE and WordPiece vocabs
     def get_vocab_base(self) -> tuple[list[str], list[int], str]:
         tokens: list[str] = []
@@ -1416,9 +1419,9 @@ class LlamaModel(Model):
         n_head = self.hparams["num_attention_heads"]
         n_kv_head = self.hparams.get("num_key_value_heads")
 
-        if name.endswith(("q_proj.weight", "q_proj.bias")):
+        if name.endswith(("q_proj.weight", "q_proj.bias", "q_proj.lora_B.weight")):
             data_torch = LlamaModel.permute(data_torch, n_head, n_head)
-        if name.endswith(("k_proj.weight", "k_proj.bias")):
+        if name.endswith(("k_proj.weight", "k_proj.bias", "k_proj.lora_B.weight")):
             data_torch = LlamaModel.permute(data_torch, n_head, n_kv_head)
 
         # process the experts separately
@@ -1466,6 +1469,10 @@ class LlamaModel(Model):
             if len(experts) > 0:
                 raise ValueError(f"Unprocessed experts: {experts}")
 
+    def support_lora(self) -> bool:
+        # TODO: support lora conversion for MOE
+        return "num_local_experts" not in self.hparams
+
 
 @Model.register("BitnetForCausalLM")
 class BitnetModel(Model):

convert_lora_to_gguf.py

@@ -9,7 +9,7 @@ import os
 import sys
 import types
 from pathlib import Path
-from typing import TYPE_CHECKING, Iterable, Iterator
+from typing import TYPE_CHECKING, Iterator
 
 import torch
 
@@ -26,6 +26,13 @@ from convert_hf_to_gguf import Model
 logger = logging.getLogger("lora-to-gguf")
 
 
+def get_base_tensor_name(lora_tensor_name: str) -> str:
+    base_name = lora_tensor_name.replace("base_model.model.", "")
+    base_name = base_name.replace(".lora_A.weight", ".weight")
+    base_name = base_name.replace(".lora_B.weight", ".weight")
+    return base_name
+
+
 def parse_args() -> argparse.Namespace:
     parser = argparse.ArgumentParser(
         description="Convert a huggingface PEFT LoRA adapter to a GGML compatible file")
@@ -103,43 +110,47 @@ if __name__ == '__main__':
 
         # adapter_config = json.load(input_json)
         model_instance.gguf_writer.add_string("training.type", "finetune_lora")
+        if not model_instance.support_lora():
+            logger.error("LoRA conversion is not yet supported for this model")
+            sys.exit(1)
 
-    map_tensors: dict[str, Tensor] = {}
+    # map original name to gguf name
+    map_name: dict[str, str] = {}
     for tensor_name, tensor in lora_model.items():
-        orig_name = tensor_name.replace("base_model.model.", "")
-        orig_name = orig_name.replace(".lora_A.weight", ".weight")
-        orig_name = orig_name.replace(".lora_B.weight", ".weight")
+        base_name = get_base_tensor_name(tensor_name)
         is_lora_a = ".lora_A.weight" in tensor_name
         is_lora_b = ".lora_B.weight" in tensor_name
         if not is_lora_a and not is_lora_b:
             logger.error(f"Unexpected name '{tensor_name}': Not a lora_A or lora_B tensor")
             sys.exit(1)
-        dest_name = model_instance.map_tensor_name(orig_name)
+        dest_name = model_instance.map_tensor_name(base_name)
         dest_name = f"{dest_name}.lora_a" if is_lora_a else f"{dest_name}.lora_b"
-        # logger.info(f"{orig_name} --> {dest_name}")
-        map_tensors[dest_name] = tensor
+        map_name[tensor_name] = dest_name
+
+    # overwrite method
+    def map_tensor_name(self, name: str) -> Iterator[tuple[str, Tensor]]:
+        return map_name[name]
 
     # overwrite method
     def get_tensors(self) -> Iterator[tuple[str, Tensor]]:
-        for name, tensor in map_tensors.items():
+        for name, tensor in lora_model.items():
             yield (name, tensor)
 
-    # overwrite method
-    def modify_tensors(self, data_torch: Tensor, name: str, bid: int | None) -> Iterable[tuple[str, Tensor]]:
-        del bid  # unused
-        # TODO: This will not take into account tensor transformations
-        return [(name, data_torch)]
-
     # overwrite method
     def extra_f16_tensors(self, name: str, new_name: str, bid: int | None, n_dims: int) -> bool:
         del name, new_name, bid, n_dims  # unused
         return ftype != gguf.LlamaFileType.ALL_F32
 
+    model_instance._map_tensor_name = model_instance.map_tensor_name
+    model_instance.map_tensor_name = types.MethodType(map_tensor_name, model_instance)
+
+    model_instance._get_tensors = model_instance.get_tensors
     model_instance.get_tensors = types.MethodType(get_tensors, model_instance)
-    model_instance.modify_tensors = types.MethodType(modify_tensors, model_instance)
+
+    model_instance._extra_f16_tensors = model_instance.extra_f16_tensors
     model_instance.extra_f16_tensors = types.MethodType(extra_f16_tensors, model_instance)
 
     model_instance.gguf_writer.add_quantization_version(gguf.GGML_QUANT_VERSION)
     logger.info("Exporting model...")
     model_instance.write()
-    logger.info(f"Model successfully exported to {fname_out}")
+    logger.info(f"Model successfully exported to {model_instance.fname_out}")