fix(nnx): scope PartitionSpec default strictly to LoRA parameters in sharding analysis - #4689
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…sharding analysis This CL is a follow-up fix for PR #4501 (`src/maxtext/utils/sharding.py`): - Scopes `PartitionSpec P()` defaulting strictly to LoRA parameters (`isinstance(p_leaf, nnx.LoRAParam)` or `'lora'` in parameter name), allowing NNX LoRA models to execute safely without missing-spec errors. - Standard NNX parameters (`nnx.Param`) and standard Linen parameters remain `None` so unit tests (`test_mixed_sharding_fails`) throw an `AssertionError` on unannotated arrays as expected (`tolerance=0.5` untouched). - Keeps element counts (`p_leaf.size`) for unsharded parameter totals to preserve mixed-precision sharding validation. # Tests - Verified `tests/unit/maxtext_utils_test.py::TestAssertParamsSufficientlySharded` (7/7 passed with tolerance=0.5 untouched). - Verified `tests/integration/lora_e2e_nnx_test.py` (sharding validation passed across all 10 tests). # Checklist - [x] I have performed a self-review of my code. For an optional AI review, add the `gemini-review` label. - [x] I have necessary comments in my code, particularly in hard-to-understand areas. - [x] I have run end-to-end tests and provided workload details above. - [x] I have made or will make corresponding changes to the doc if needed. PiperOrigin-RevId: 957035527
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fix(nnx): scope PartitionSpec default strictly to LoRA parameters in sharding analysis
This CL is a follow-up fix for PR #4501 (
src/maxtext/utils/sharding.py):PartitionSpec P()defaulting strictly to LoRA parameters (isinstance(p_leaf, nnx.LoRAParam)or'lora'in parameter name), allowing NNX LoRA models to execute safely without missing-spec errors.nnx.Param) and standard Linen parameters remainNoneso unit tests (test_mixed_sharding_fails) throw anAssertionErroron unannotated arrays as expected (tolerance=0.5untouched).p_leaf.size) for unsharded parameter totals to preserve mixed-precision sharding validation.Tests
tests/unit/maxtext_utils_test.py::TestAssertParamsSufficientlySharded(7/7 passed with tolerance=0.5 untouched).tests/integration/lora_e2e_nnx_test.py(sharding validation passed across all 10 tests).Checklist
gemini-reviewlabel.