Serialize NamedData in PTE file #8847
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1. Serialize NamedData in PTE file
2. Add NamedDataStore to EdgeProgramManager
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Serializing NamedData is slightly different to constant/delegate data as each segment comes with its own alignment.
**An example:**
Given NamedData = {"key": data}. Data is 250 bytes.
- BackendA requires data with alignment=3
- BackendB requires data with alignment=4
Then, data0 should be serialized with alignment of lcm(3, 4) = 12
At serialization, ExecuTorch has a 'segment_alignment' that defaults to 128. Data is now serialized to lcm(12, 128) = 384.
Inside the DataSegment, we want to store the original size of the data (250). The offset of the subsequent DataSegment would be 384 bytes after the start of this one.
**Design**
Introduce a new dataclass 'AlignedData' that stores the buffer and any alignment that's required. This is used when assembling Program.segments to ensure we get lcm(buffer_alignment, segment_alignment).
Note: The default segment_alignment can be overridden inside 'ExecutorchBackendConfig'.
Differential Revision: [D69764150](https://our.internmc.facebook.com/intern/diff/D69764150/)
ghstack-source-id: 269030449
Pull Request resolved: #8835
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JacobSzwejbka,
tarun292 and
larryliu0820
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🔗 Helpful Links🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8847
Note: Links to docs will display an error until the docs builds have been completed. ❌ 1 New Failure, 39 PendingAs of commit 528b555 with merge base 4df0ade ( 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: #8835 by @lucylq
^ 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/lucylq/48/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/48/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/48/orig
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