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Fix regression with 8 bit quant mat mul. #15445
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    | 🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15445
 Note: Links to docs will display an error until the docs builds have been completed. ✅ No FailuresAs of commit 524fd7d with merge base c0df044 ( This comment was automatically generated by Dr. CI and updates every 15 minutes. | 
| @trivedivivek has exported this pull request. If you are a Meta employee, you can view the originating Diff in D85767668. | 
    
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
    
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
    
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
    
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
    
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
    
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Differential Revision: D85767668
              
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Reviewed By: SS-JIA Differential Revision: D85767668
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    Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before. Reviewed By: SS-JIA Differential Revision: D85767668
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    release notes: vulkan
  Changes to the Vulkan backend delegate 
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Summary: This diff fixes a regression in the 8-bit quantized matrix multiplication operation, by reducing number of columns processed to 1 instead of 2 as before.
Differential Revision: D85767668