viable/strict/1792082435: [Docs] Add accelerator backend test reuse guide (#189376)
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Summary This PR adds a guideline document for out-of-tree (OOT) accelerator backend developers on reusing PyTorch's upstream test suite. The guide covers: Test categorization and the role of hardware classification in selecting applicable tests. Test reuse strategies for OOT backends, including adapting upstream tests to match backend capabilities without modifying upstream tests. Configuration options for handling…
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