Modify signature of dequantize ops for decomposed quantized Tensor (#119173) (#121450)
Summary:
X-link: https://github.com/pytorch/executorch/pull/2308
Note: The initial purpose of this PR is to draw suggestion and feedback regarding better alternative, if any.
At present, dequantize op for decomposed quantized Tensor representation e.g. dequantize_per_tensor() assumes the output dtype as torch.float and hence, it does not have the output dtype in its operator argument list. However, this op signature becomes unusable when the assumption breaks. Because, in case the output dtype is different from torch.float, there is no way to specify the same during dequantization.
This change is aimed at generalizing the signature of dequantize op like dequantize_per_tensor() for wider use-cases where the output dtype can be different from torch.float and needs to passed during dequantization. The proposal is to use an additional argument named 'output_dtype' to solve the problem. However, we would also like to have suggestion and feedback regarding any better alternative that can be used instead.
cc jerryzh168 jianyuh raghuramank100 jamesr66a vkuzo jgong5 Xia-Weiwen leslie-fang-intel
Reviewed By: digantdesai
Differential Revision: D53590486
Pulled By: manuelcandales
Co-authored-by: kausik <kmaiti@habana.ai>
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121450
Approved by: https://github.com/jerryzh168
