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gguf-py : add support for endian conversion of BF16 data (#16594)

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BF16 requires special handling in this script
while it's a 2-bytes data, but view is 1-byte by default.
Switch to correct view before attempting byteswapping.

With this change correctly byteswapping models like
Meta-Llama-3-8B-Instruct-bf16-GGUF
should be possible.
This commit is contained in:
Aleksei Nikiforov
2025-10-15 22:43:08 +02:00
committed by GitHub
parent 466c1911ab
commit 7adc79c032
1 changed files with 6 additions and 0 deletions
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6
gguf-py/gguf/scripts/gguf_convert_endian.py
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@@ -91,6 +91,7 @@ def convert_byteorder(reader: gguf.GGUFReader, args: argparse.Namespace) -> None
tensor.tensor_type not in (
gguf.GGMLQuantizationType.F32,
gguf.GGMLQuantizationType.F16,
gguf.GGMLQuantizationType.BF16,
):
raise ValueError(f"Cannot handle type {tensor.tensor_type.name} for tensor {repr(tensor.name)}")
logger.info(f"* Preparing to convert from {file_endian} to {order}")
@@ -148,6 +149,11 @@ def convert_byteorder(reader: gguf.GGUFReader, args: argparse.Namespace) -> None
# restore old shape in case it's ever used
tensor.data.resize(oldshape)
elif tensor.tensor_type == gguf.GGMLQuantizationType.BF16:
# Special case for BF16
# It is 2-bytes data, but by default view loads it as 1-byte data.
# Change to correct view before byteswapping.
tensor.data.view(dtype=np.uint16).byteswap(inplace=True)
else:
# Handle other tensor types
tensor.data.byteswap(inplace=True)