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[ONNX] Add SimplifiedLayerNormalization converter for Relax frontend - #20752
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- Implement convert_onnx_simplifiedlayernormalization in onnx_frontend.py - Map ONNX SimplifiedLayerNorm (RMSNorm variant) to Relax IR - Support epsilon, axis attributes and optional bias input - Add unit tests covering basic and edge cases Fixes apache#20625
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Background
ONNX SimplifiedLayerNormalization is an RMSNorm variant used by models like SmolLM2. TVM's ONNX frontend currently lacks this op converter, blocking end-to-end import of such models.
Problem
Missing converter causes ONNX import to fail with
Unsupported operator: SimplifiedLayerNormalization.Solution
convert_onnx_simplifiedlayernormalizationin onnx_frontend.pyTesting
Fixes #20625