[Relax][Frontend][TFLite] Add SCATTER_ND operator for Relax TFLite#19490
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This pull request adds support for the SCATTER_ND operator to the TFLite frontend in Relax and includes a new test case to verify its functionality. The review feedback highlights two necessary corrections: the indices tensor needs to be permuted to align with Relax's expected layout (where the index depth is the first dimension), and the shape tensor must be explicitly cast to int64 when handled dynamically to satisfy the requirements of the tensor_to_shape operator.
tlopex
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## Summary This PR adds Relax TFLite frontend support for the following segment operators from #19412: - `SEGMENT_SUM` - `UNSORTED_SEGMENT_MIN` - `UNSORTED_SEGMENT_PROD` These operators are lowered through `relax.op.scatter_nd` with the corresponding reduction modes. ## Changes ### TFLite Frontend 1. Add TFLite converter mappings for segment operators: - `SEGMENT_SUM` -> `scatter_nd(..., reduction="add")` - `UNSORTED_SEGMENT_MIN` -> `scatter_nd(..., reduction="min")` - `UNSORTED_SEGMENT_PROD` -> `scatter_nd(..., reduction="mul")` 2. Add shared segment lowering logic: - Convert `segment_ids` into scatter indices via `expand_dims`. - Build the output shape from `num_segments` or constant `segment_ids`. - Initialize the scatter base tensor with the correct reduction identity. ### Tests Add TFLite frontend tests for: - `test_segment_sum` - `test_unsorted_segment_min` - `test_unsorted_segment_prod` Each test verifies the imported Relax IR lowers to `R.scatter_nd` with the expected reduction mode and base tensor initialization. ## Testing All targeted tests pass: ```bash python -m pytest \ tests/python/relax/test_frontend_tflite.py::test_scatter_nd \ tests/python/relax/test_frontend_tflite.py::test_segment_sum \ tests/python/relax/test_frontend_tflite.py::test_unsorted_segment_min \ tests/python/relax/test_frontend_tflite.py::test_unsorted_segment_prod \ -q ``` ## References - Issue #19412: TFLite Relax frontend operator support tracking - Related PR #19490: Adds SCATTER_ND support
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This PR adds support for the
SCATTER_NDoperator in the Relax TFLite frontend.Key Changes:
convert_scatter_ndto parseindicesandupdates.to_int_listandrelax.op.tensor_to_shape.relax.op.zerosto initialize the base array based on theupdatesprecision dtype.SCATTER_NDto the correspondingrelax.op.scatter_nd()target.convert_mapand provided the matching unit test in test_frontend_tflite.py.Testing:
Passed unit tests
Related to #19412