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NF4 checkpoint loading #9

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NF4 checkpoint loading #9

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8 changes: 6 additions & 2 deletions bitsandbytes/backends/hpu.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,7 @@
import torch

from bitsandbytes.functional import get_4bit_type
from bitsandbytes.utils import QuantState
from bitsandbytes.utils import QuantState, reverse_4bit_compress_format

from .base import Backend
from .cpu_xpu_common import (
Expand Down Expand Up @@ -191,9 +191,13 @@ def dequantize_nf4_impl(
HPU dequantization function for NF4 quantized tensors.
"""
assert_on_hpu([input, absmax])

if len(input.shape) == 2:
input = reverse_4bit_compress_format(input.squeeze())

out_shape = (math.prod(quant_state.shape),)
out_dq = torch.ops.hpu.dequantize_nf4(
input, absmax, blocksize, out_shape=out_shape, out_dtype=quant_state.dtype
input, absmax.to(quant_state.dtype), blocksize, out_shape=out_shape, out_dtype=quant_state.dtype
)
output = out_dq.reshape(quant_state.shape).T
return output
Expand Down
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