PT2ArchiveDataMap

[lucylq]

Stack from ghstack (oldest at bottom):

• Generate pt2 archive with pte file #14124
• -> PT2ArchiveDataMap #13973

This diff introduces the PT2ArchiveDataMap, which reads the weights in .pt2 archive files.

1. Open the archive file with miniz
2. There are two json config files (weights_config.json, constants_config.json) with information on weight name -> {weight path, weight metadata}. Open and extract weight information into unordered_maps; then free the json blobs.
3. For get_tensor_layout calls, return the json information.
4. For get_data calls, use miniz to calculate the offset + size and then use data loader. PT2 archive files are not compressed (to allow mmap-ing), so this is fine.

PT2 archive format: https://docs.google.com/document/d/1xdx3I4zK6naPEWX3e49rCUccZeAC9zMLCFKXvUQFR7o/edit?tab=t.0

Serde: https://docs.google.com/document/d/11X-KsLPMJGdEr4sG4sCNLnGLhSKrc8utDGMQqFbZx9E/edit?tab=t.0#heading=h.tsw6d16xh497

---

TODO in subsequent diffs

• convert stride to dim order
• Additional testing; failure cases, model file with constants as well as weights, model with no weights.
• CMake for OSS

Differential Revision: D81248896

[pytorch-bot]

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❌ 2 New Failures, 2 Unrelated Failures

As of commit 16600d9 with merge base 151f3be ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
• pull / unittest / macos / macos-job (gh)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• periodic / test-models-linux (cmake, vit, portable, linux.2xlarge, 90) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (resnet18, xnnpack-quantization-delegation, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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This pull request was exported from Phabricator. Differential Revision: D81248896

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This pull request was exported from Phabricator. Differential Revision: D81248896