[ET-VK] Add 'half' variants to some Llama operators + enable llama vulkan export with force_fp16 flag

[SS-JIA]

Stack from ghstack (oldest at bottom):

• -> [ET-VK] Add 'half' variants to some Llama operators + enable llama vulkan export with force_fp16 flag #14223
• [ET-VK] Enable automatic dtype conversion when copying to/from staging buffer #14222

Title says it all!

Differential Revision: D82234179

cc @manuelcandales @cbilgin

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14223

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 1 New Failure, 1 Cancelled Job, 3 Pending, 5 Unrelated Failures

As of commit 85b0e4f with merge base b2ae2b4 ():

NEW FAILURE - The following job has failed:

• pull / unittest / linux / linux-job (gh)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

CANCELLED JOB - The following job was cancelled. Please retry:

• pull / test-openvino-linux / linux-job (gh)

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Build Windows Wheels / pytorch/executorch / build-wheel-py3_10-cpu (gh) (trunk failure)
  RuntimeError: Failed to install QNN SDK. Please check the logs above.
• Build Windows Wheels / pytorch/executorch / upload / upload-wheel-py3_10-cpu (gh) (trunk failure)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x64
• pull / test-binary-size-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-moshi-linux / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.
• pull / test-setup-linux-gcc / linux-job (gh) (trunk failure)
  ##[error]The operation was canceled.

This comment was automatically generated by Dr. CI and updates every 15 minutes.

[facebook-github-bot]

@SS-JIA has exported this pull request. If you are a Meta employee, you can view the originating diff in D82234179.

[github-actions]

This PR needs a release notes: label

If your change should be included in the release notes (i.e. would users of this library care about this change?), please use a label starting with release notes:. This helps us keep track and include your important work in the next release notes.

To add a label, you can comment to pytorchbot, for example
@pytorchbot label "release notes: none"

For more information, see
https://github.com/pytorch/pytorch/wiki/PyTorch-AutoLabel-Bot#why-categorize-for-release-notes-and-how-does-it-work.

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D82234179

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D82234179