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[executorch][native] Suggest rounding to nearest when engines narrow values - #24539
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…values Pull Request resolved: #24364 Rounding toward zero when narrowing f32 to f16, which Vulkan and WebGPU allow, biases every stored value toward zero, and the bias compounds across layers. The README suggests rounding to nearest, ties to even, as eager does. Authored with Claude Code. @bypass-github-export-checks @bypass-github-pytorch-ci-checks @bypass-github-executorch-ci-checks ghstack-source-id: 463657754 @exported-using-ghexport Differential Revision: [D128254885](https://our.internmc.facebook.com/intern/diff/D128254885/)
🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/24539
Note: Links to docs will display an error until the docs builds have been completed. ❌ 2 New FailuresAs of commit adbb6ed with merge base 0f8e096 ( NEW FAILURES - The following jobs have 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: #24364 by @digantdesai
^ 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/digantdesai/191/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/digantdesai/191/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/digantdesai/190/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/digantdesai/191/orig
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