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Add function to reverse 4bit weights for HPU #1757

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Merged
matthewdouglas merged 2 commits into from
Sep 19, 2025
Merged

Add function to reverse 4bit weights for HPU #1757

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194fef0
Add function to reverse 4bit weights for HPU
vivekgoe Sep 18, 2025
a7259df
Fix lint error
vivekgoe Sep 19, 2025
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11 changes: 9 additions & 2 deletions bitsandbytes/backends/hpu/ops.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3,12 +3,19 @@

import torch

from bitsandbytes.utils import _reverse_4bit_compress_format

from ..._ops import register_kernel
from ..utils import GAUDI_SW_VER


# convert btw standard 4-bit compression format and ipex compression format
# needed for backward compatibility with older versions of gaudi sw
def _reverse_4bit_compress_format(weight: torch.Tensor):
out_1 = (weight & 0xF0) >> 4
out_2 = (weight & 0xF) << 4
out = out_1 | out_2
return out


@register_kernel("bitsandbytes::dequantize_4bit", "hpu")
def _(
A: torch.Tensor,
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