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#!/usr/bin/env python3
from __future__ import annotations
import argparse
import os
import sys
from pathlib import Path
import numpy as np
# Necessary to load the local gguf package
if "NO_LOCAL_GGUF" not in os.environ and (Path(__file__).parent.parent.parent / 'gguf-py').exists():
sys.path.insert(0, str(Path(__file__).parent.parent))
import gguf
def convert_byteorder(reader: gguf.GGUFReader, args: argparse.Namespace) -> None:
if np.uint32(1) == np.uint32(1).newbyteorder("<"):
# Host is little endian
host_endian = "little"
swapped_endian = "big"
else:
# Sorry PDP or other weird systems that don't use BE or LE.
host_endian = "big"
swapped_endian = "little"
if reader.byte_order == "S":
file_endian = swapped_endian
else:
file_endian = host_endian
order = host_endian if args.order == "native" else args.order
print(f"* Host is {host_endian.upper()} endian, GGUF file seems to be {file_endian.upper()} endian")
if file_endian == order:
print(f"* File is already {order.upper()} endian. Nothing to do.")
sys.exit(0)
print("* Checking tensors for conversion compatibility")
for tensor in reader.tensors:
if tensor.tensor_type not in (
gguf.GGMLQuantizationType.F32,
gguf.GGMLQuantizationType.F16,
gguf.GGMLQuantizationType.Q8_0,
):
raise ValueError(f"Cannot handle type {tensor.tensor_type.name} for tensor {repr(tensor.name)}")
print(f"* Preparing to convert from {file_endian.upper()} to {order.upper()}")
if args.dry_run:
return
print("\n*** Warning *** Warning *** Warning **")
print("* This conversion process may damage the file. Ensure you have a backup.")
if order != host_endian:
print("* Requested endian differs from host, you will not be able to load the model on this machine.")
print("* The file will be modified immediately, so if conversion fails or is interrupted")
print("* the file will be corrupted. Enter exactly YES if you are positive you want to proceed:")
response = input("YES, I am sure> ")
if response != "YES":
print("You didn't enter YES. Okay then, see ya!")
sys.exit(0)
print(f"\n* Converting fields ({len(reader.fields)})")
for idx, field in enumerate(reader.fields.values()):
print(f"- {idx:4}: Converting field {repr(field.name)}, part count: {len(field.parts)}")
for part in field.parts:
part.byteswap(inplace=True)
print(f"\n* Converting tensors ({len(reader.tensors)})")
for idx, tensor in enumerate(reader.tensors):
print(
f" - {idx:4}: Converting tensor {repr(tensor.name)}, type={tensor.tensor_type.name}, "
f"elements={tensor.n_elements}... ",
end="",
)
tensor_type = tensor.tensor_type
for part in tensor.field.parts:
part.byteswap(inplace=True)
if tensor_type != gguf.GGMLQuantizationType.Q8_0:
tensor.data.byteswap(inplace=True)
print()
continue
# A Q8_0 block consists of a f16 delta followed by 32 int8 quants, so 34 bytes
block_size = 34
n_blocks = len(tensor.data) // block_size
for block_num in range(n_blocks):
block_offs = block_num * block_size
# I know I said f16, but it doesn't matter here - any simple 16 bit type works.
delta = tensor.data[block_offs:block_offs + 2].view(dtype=np.uint16)
delta.byteswap(inplace=True)
if block_num % 100000 == 0:
print(f"[{(n_blocks - block_num) // 1000}K]", end="")
sys.stdout.flush()
print()
print("* Completion")
def main() -> None:
parser = argparse.ArgumentParser(description="Convert GGUF file byte order")
parser.add_argument(
"model", type=str,
help="GGUF format model filename",
)
parser.add_argument(
"order", type=str, choices=['big', 'little', 'native'],
help="Requested byte order",
)
parser.add_argument(
"--dry-run", action="store_true",
help="Don't actually change anything",
)
args = parser.parse_args(None if len(sys.argv) > 1 else ["--help"])
print(f'* Loading: {args.model}')
reader = gguf.GGUFReader(args.model, 'r' if args.dry_run else 'r+')
convert_byteorder(reader, args)
if __name__ == "__main__":
main()
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