Support PaddlePaddle with compatible API and tvm-ffi#2
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<!-- .github/pull_request_template.md --> ## 📌 Description To fix the following bug: When the CuteDSL MoE kernels were ported from TensorRT-LLM to FlashInfer, the mPtrPermutedIdxToExpandedIdx field was accidentally dropped from the routing kernel's DataBase struct in RoutingKernel.h. TRT-LLM's routing kernel produces three reverse-mapping outputs: 1. mPtrExpandedIdxToPermutedIdx[expandedIdx] = permutedIdx — forward mapping 2. mPtrPermutedIdxToExpandedIdx[permutedIdx] = expandedIdx — reverse to expanded index (token_idx * topk + k) 3. mPtrPermutedIdxToTokenIdx[permutedIdx] = tokenIdx — reverse to token index only FlashInfer's port kept only #1 and #3, dropping #2. The binding in moe_utils_binding.cu then had to wire the Python buffer permuted_idx_to_expanded_idx to the only available reverse-mapping field — mPtrPermutedIdxToTokenIdx — which writes plain tokenIdx instead of expandedIdx. The Impact The CuteDSL kernels (GEMM1 gather, moe_output_memset, GEMM2 finalize) all expect expanded indices and derive the token index via expanded_idx // topk. When they received plain tokenIdx instead, they computed tokenIdx // topk — yielding the wrong A row for gather, wrong zero-init for memset, and wrong scatter position + wrong routing scale for finalize. <!-- What does this PR do? Briefly describe the changes and why they’re needed. --> ## 🔍 Related Issues <!-- Link any related issues here --> ## 🚀 Pull Request Checklist Thank you for contributing to FlashInfer! Before we review your pull request, please make sure the following items are complete. ### ✅ Pre-commit Checks - [ ] I have installed `pre-commit` by running `pip install pre-commit` (or used your preferred method). - [ ] I have installed the hooks with `pre-commit install`. - [ ] I have run the hooks manually with `pre-commit run --all-files` and fixed any reported issues. > If you are unsure about how to set up `pre-commit`, see [the pre-commit documentation](https://pre-commit.com/). ## 🧪 Tests - [ ] Tests have been added or updated as needed. - [ ] All tests are passing (`unittest`, etc.). ## Reviewer Notes <!-- Optional: anything you'd like reviewers to focus on, concerns, etc. --> <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Refactor** * Refined MOE (Mixture of Experts) routing infrastructure by extending index mapping capabilities across multiple kernel implementations to improve internal data flow consistency. * **Tests** * Strengthened accuracy validation thresholds from 0.925 to 0.97 with adjusted error tolerance parameters, ensuring more rigorous testing of MOE operations under FP4 quantization conditions. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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A new approach to replace #1. This PR need PaddlePaddle/Paddle#75651 and PaddlePaddle/Paddle#75650.