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[Relax][ONNX] Support Call and Var sequence expressions in sequence operators - #20964
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This PR resolves an issue where Relax ONNX sequence operators (
SequenceLength,SequenceAt,SequenceErase,SequenceInsert, andConcatFromSequence) crashed withTypeErrorwhen their input sequence was a Relax AST node (such asrelax.Callorrelax.VarwithTupleType) rather than a Python list or static tuple.Summary of Changes
_get_sequence_length(seq)and_get_sequence_elements(bb, seq)inpython/tvm/relax/frontend/onnx/onnx_frontend.pyto safely inspect length and unpack sequence elements across Python sequences (list,tuple),relax.Tuple, and Relax expressions withTupleType(extracting elements viarelax.TupleGetItem).SequenceLength,SequenceAt,SequenceErase,SequenceInsert, andConcatFromSequenceto utilize these helpers.SequenceAt.tests/python/relax/test_frontend_onnx.pyverifying chaining ofSplitToSequencewith each sequence operation.Closes #20949