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bump: bitsandbytes >=0.45.2,<0.47.0 & compatibility patch for bnb.functional.int8_double_quant #20911

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Merged
Borda merged 3 commits into from
Jun 16, 2025
Merged

bump: bitsandbytes >=0.45.2,<0.47.0 & compatibility patch for bnb.functional.int8_double_quant #20911

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4a61395
compatibility patch for `bnb.functional.int8_double_quant`
Borda Jun 16, 2025
d5ab261
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Borda Jun 16, 2025
7d5d1b0
bitsandbytes >=0.45.2,<0.47.0
Borda Jun 16, 2025
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7 changes: 4 additions & 3 deletions src/lightning/fabric/plugins/precision/bitsandbytes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -256,9 +256,10 @@ def quantize(
if int8params.has_fp16_weights:
int8params.data = B
else:
CB, CBt, SCB, SCBt, _ = bnb.functional.double_quant(B)
del CBt
del SCBt
if hasattr(bnb.functional, "double_quant"):
CB, _, SCB, _, _ = bnb.functional.double_quant(B)
else: # for versions 0.46+
CB, SCB = bnb.functional.int8_double_quant(B)
int8params.data = CB
setattr(int8params, "CB", CB)
setattr(int8params, "SCB", SCB)
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