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Avoid squeezing original weight tensors with leading dim 1 #294

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Merged
merged 4 commits into from
Sep 9, 2025
Merged

Avoid squeezing original weight tensors with leading dim 1 #294

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867922a
Do not squeeze weights with leading dim 1
cjluo-nv Sep 5, 2025
76ce70a
Update quant_utils.py
cjluo-nv Sep 5, 2025
501d8f0
Update quant_utils.py
cjluo-nv Sep 5, 2025
ab4e6d9
Merge branch 'main' into cjluo-nv-patch-1
cjluo-nv Sep 8, 2025
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9 changes: 7 additions & 2 deletions modelopt/torch/export/quant_utils.py
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Original file line number Diff line number Diff line change
Expand Up @@ -869,9 +869,14 @@ def postprocess_state_dict(state_dict: dict, maxbound: float, quantization: str
post_state_dict[prefix + new_suffix] = value
break

# Squeeze tensors with a leading dimension of 1
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Can you specify what errors you get for phi4-mm?

We needed this for sticking with our ckpt format and I remember if we don’t squeeze it will break some deployment flow with TRT-LLM.
It works for all our supported models so far.

# Squeeze scales with a leading dimension of 1
for key, value in post_state_dict.items():
if isinstance(value, torch.Tensor) and value.dim() == 3 and value.shape[0] == 1:
if (
"scale" in key
and isinstance(value, torch.Tensor)
and value.dim() == 3
and value.shape[0] == 1
):
post_state_dict[key] = value.squeeze(0)

# remove real quant parameters from the state dict
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