[ET] enabling half dtype input for quantization#11668
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Pull Request resolved: #11479 # Context Currently the cpu implementation for the quantization operator (which includes `quantize_per_token`, `quantize_per_tensor`, and `quantize_per_channel`), does not inherently support half (fp16) input scalar types. In order to align with the PyTorch implementation that accepts fp16 and bfp16 inputs, this diff aims to enable half input dtype support for the quantization operators. We will be comparing this implementation against the vulkan operators. # Changes As defined in ExecuTorch [scalar_type_util.h](https://github.com/pytorch/executorch/blob/053686242c1687f0d51b3bb8befd14b047d7b025/runtime/core/exec_aten/util/scalar_type_util.h#L190) file, there is a method to enable support simply changing which preprocessor is called to ET_FORALL_FLOATH_TYPES. This enables support for Half (fp16), Float (fp32), and Double (fp64). I have also included more comprehensive testing against the input dtypes, including adding double testing since it didn't already exist before. Instead of just confirming that all the output dtypes are supported, we also have a check that all input dtypes are supported now as well. ghstack-source-id: 290376481 @exported-using-ghexport Differential Revision: [D76053764](https://our.internmc.facebook.com/intern/diff/D76053764/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11668
Note: Links to docs will display an error until the docs builds have been completed. ❌ 1 New FailureAs of commit c628aab with merge base 56392aa ( NEW FAILURE - The following job has failed:
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This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #11479 by @ahmtox
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/ahmtox/12/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/ahmtox/12/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/ahmtox/12/orig
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