Aharrypotter opened a new pull request, #20114:
URL: https://github.com/apache/tvm/pull/20114
## Summary
This PR adds Relax TFLite frontend support for the remaining StableHLO shape
operators tracked by #19519:
- `STABLEHLO_RESHAPE` -> `R.reshape`
- `STABLEHLO_SLICE` -> `R.strided_slice`
- `STABLEHLO_TRANSPOSE` -> `R.permute_dims`
It carries forward the implementation from #19869 by @Mohxen onto the current
`main` branch and addresses the outstanding review feedback by using explicit
`ValueError` checks for the input and output arity of all three new
converters.
## Design
### StableHLO reshape
`STABLEHLO_RESHAPE` has one tensor input and a statically described result
shape. The converter reads that shape from the TFLite output tensor metadata
and emits `relax.op.reshape`.
### StableHLO slice
`STABLEHLO_SLICE` stores `start_indices`, `limit_indices`, and `strides` in
`StablehloSliceOptions`. The converter parses those vectors, applies them to
all
input axes, and emits `relax.op.strided_slice`.
### StableHLO transpose
`STABLEHLO_TRANSPOSE` stores its permutation in
`StablehloTransposeOptions`. The converter parses the permutation and emits
`relax.op.permute_dims`.
## Operator Support
| Operator | TFLite metadata | Relax lowering | Supported subset |
|---|---|---|---|
| `STABLEHLO_RESHAPE` | output tensor shape | `R.reshape` | static result
shape |
| `STABLEHLO_SLICE` | start, limit, and stride vectors | `R.strided_slice` |
static slice attributes |
| `STABLEHLO_TRANSPOSE` | permutation vector | `R.permute_dims` | static
permutation |
## Tests
The tests manually build minimal TFLite flatbuffers for each StableHLO
operator and compare the imported Relax IR with
`tvm.ir.assert_structural_equal`. The slice fixture exercises non-unit
strides,
and the transpose fixture uses a nontrivial three-dimensional permutation.
Local validation:
```bash
python -m ruff format --check \
python/tvm/relax/frontend/tflite/tflite_frontend.py \
tests/python/relax/test_frontend_tflite.py
python -m ruff check \
python/tvm/relax/frontend/tflite/tflite_frontend.py \
tests/python/relax/test_frontend_tflite.py
python -m py_compile \
python/tvm/relax/frontend/tflite/tflite_frontend.py \
tests/python/relax/test_frontend_tflite.py
python -m pytest tests/python/relax/test_frontend_tflite.py \
-k "stablehlo_reshape or stablehlo_slice or stablehlo_transpose" -q
```
Result:
```text
ruff format --check: 2 files already formatted
ruff check: All checks passed
py_compile: passed
targeted StableHLO shape tests: 3 passed, 551 deselected
```
## References
- Completes the remaining StableHLO shape-operator items in #19519.
- Continues and supersedes #19869 by @Mohxen.
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