feat: Add loading sharded GGUF files from HuggingFace with Llama.from_pretrained(additional_files=[...]) . Closes #1341

Co-authored-by: Andrei <abetlen@gmail.com>

Author: Gnurro

llama_cpp/llama.py

@@ -2227,6 +2227,7 @@ def from_pretrained(
         cls,
         repo_id: str,
         filename: Optional[str],
+        additional_files: Optional[List] = None,
         local_dir: Optional[Union[str, os.PathLike[str]]] = None,
         local_dir_use_symlinks: Union[bool, Literal["auto"]] = "auto",
         cache_dir: Optional[Union[str, os.PathLike[str]]] = None,
@@ -2239,6 +2240,7 @@ def from_pretrained(
         Args:
             repo_id: The model repo id.
             filename: A filename or glob pattern to match the model file in the repo.
+            additional_files: A list of filenames or glob patterns to match additional model files in the repo.
             local_dir: The local directory to save the model to.
             local_dir_use_symlinks: Whether to use symlinks when downloading the model.
             **kwargs: Additional keyword arguments to pass to the Llama constructor.
@@ -2269,6 +2271,7 @@ def from_pretrained(
             rel_path = Path(file).relative_to(repo_id)
             file_list.append(str(rel_path))
 
+        # find the only/first shard file:
         matching_files = [file for file in file_list if fnmatch.fnmatch(file, filename)]  # type: ignore
 
         if len(matching_files) == 0:
@@ -2298,6 +2301,35 @@ def from_pretrained(
             cache_dir=cache_dir,
         )
 
+        if additional_files:
+            for additonal_file_name in additional_files:
+                # find the additional shard file:
+                matching_additional_files = [file for file in file_list if fnmatch.fnmatch(file, additonal_file_name)]
+
+                if len(matching_additional_files) == 0:
+                    raise ValueError(
+                        f"No file found in {repo_id} that match {additonal_file_name}\n\n"
+                        f"Available Files:\n{json.dumps(file_list)}"
+                    )
+
+                if len(matching_additional_files) > 1:
+                    raise ValueError(
+                        f"Multiple files found in {repo_id} matching {additonal_file_name}\n\n"
+                        f"Available Files:\n{json.dumps(files)}"
+                    )
+
+                (matching_additional_file,) = matching_additional_files
+
+                # download the additional file
+                hf_hub_download(
+                    repo_id=repo_id,
+                    filename=matching_additional_file,
+                    subfolder=subfolder,
+                    local_dir=local_dir,
+                    local_dir_use_symlinks=local_dir_use_symlinks,
+                    cache_dir=cache_dir,
+                )
+
         if local_dir is None:
             model_path = hf_hub_download(
                 repo_id=repo_id,
@@ -2311,6 +2343,7 @@ def from_pretrained(
         else:
             model_path = os.path.join(local_dir, filename)
 
+        # loading the first file of a sharded GGUF loads all remaining shard files in the subfolder
         return cls(
             model_path=model_path,
             **kwargs,