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Fixes issue #156414: Fixes bug in implementation of _combine_histogram (Follow up) #2418

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Jun 26, 2025
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Fixes issue #156414: Fixes bug in implementation of _combine_histogram (Follow up) #2418

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2 changes: 1 addition & 1 deletion torchao/quantization/pt2e/observer.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1248,7 +1248,7 @@ def _combine_histograms(
# If the orig hist only has one value (i.e., the min and max are the same)
# we can just add it into new histogram
if orig_min == orig_max:
bin_value = torch.sum(update_hist)
bin_value = torch.sum(orig_hist)
transformed_orig_hist = (
torch.histc(orig_min, bins=self.bins, min=update_min, max=update_max) # type: ignore[arg-type]
* bin_value
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